He says the unprecedented number of promotions has been building over several seasons.
Munro said: "To answer that question about the nine players coming into the academy, to graduate from the academy into Glasgow Warriors this year, that's a huge number.
"We've never had that amount before. It's a culmination of the last two or three years."
He contrasted the current setup with previous years, when academy players largely trained separately from the professional squad.
Munro said: "The academy has always been in a situation where we would train on our own and the best players would train up with the Glasgow Warriors [first team].
"You would meet the head coaches, various head coaches over the years, and they would say, 'Well, this player is ready to step up.'"
The latest group, however, has experienced a very different pathway.
Munro explained: "The difference with this group is that they've trained fully with the Warriors, and that's not just training with them; that's they're in all the meetings, all the unit meetings, they're in the unit sessions, they're in the main team sessions.
"They're training with, they're training against players like Stafford McDowall, Scott Cummings, all these players, top international players."
He believes daily exposure to elite professionals has been key to the academy's success.
"I think the success of the academy players coming through is hugely down to their involvement and training with senior players, Scotland players, Scotland captains, British Lions.
"I mean, it's only natural that you as a young player would absolutely aspire to be one of these players."
One of the promoted players is hooker Seb Stephen, who spent time in New Zealand before joining the Glasgow pathway. Munro highlighted the value of learning from established professionals.
He said: "Seb Stephen, one of the guys in the academy that's progressing to become a Glasgow Warrior next year, and he is in some respects a late developer.
"He has specifically learned from the likes of Johnny Matthews, Gregor Hiddleston, a huge learning tool for him."
He believes the same applies across the backline.
"The same could be said for someone like Johnny Ventisei, who's learned off Huw Jones, Stafford McDowall.
"We've obviously got Kerr Yule, Kerr Johnston, the same sort of thing; they're learning off top-level players here.
"And I'm really excited about what we're going to see from them next year."
Munro says watching senior internationals every day gives young players the perfect example to follow.
"Because we've got players playing at such a high level at international level, and I've mentioned British and Irish Lions, you can only learn a huge amount from these players.
"Training with them, seeing how they conduct themselves on a day-to-day basis, seeing how they feedback to other players.
"It's a great learning tool for these players, and I have no doubt it'll bear fruit hugely for Glasgow Warriors and Scotland in the future."
He also believes Scotstoun and its supporters have helped inspire the next generation.
"I think as we know, there's some fantastic nights been had here at Scotstoun, massive crowds, sell-out crowds all the time, getting really behind the team.
"Players absolutely love playing here and playing in front of such a superb support. You can see it rubbing off on the young guys when they get the opportunity to play here."
For academy graduates making their debuts, Munro says it is the fulfilment of a lifelong ambition.
"They'll have seen some of the speeches the players make after their first caps; it's actually a boy who dreams of playing for the Glasgow Warriors, so I see no reason why that's not going to continue," he said.