Typo on broodlords. Should say 48S. But the total is correct.
Anyway, To really make your point you should have just said straight 50 corrupters. Or even better 40 corrupters, 10 infestors (and/or Viper but I think infestor is even better in this scenario), stomp the army, then morph broodlords is the real game winner.
The real kicker is the build time. Terran or Toss could spend the whole game building that army and then have it just get crushed. So even if you manage to beat Zergs comp, they can rebuild pretty much whatever comp they want after the battle, faster than you. With 6+ hatcheries injecting, getting even 40+ units back is one or two cycles of larva away.
Edit: To be clear I actually think this zerg army probably loses. With Yamato from 12 BC you could theoretically take out 12 or even more corrupters especially fighting defensively over turrets, adding thors, etc to keep the corrupters from jumping on you. Similar story with the Toss army but the more Voids, the more Toss favored. But with casters and not getting BL until after the air fight is won in this hypothetical fight, the Zerg army does look crazy unbeatable. But to be fair, a 50 corrupter army would be 7500M 5000G so super expensive but also super supply efficient. Which better supports his point actually. The corrupter is good on cost efficiency. And ridiculously good on supply efficiency.