Not exactly. It depends on the circumstances. For example, what's the quality of competition the 'hot-housed' team regularly faces?
US' NTDP system works because they regularly face competition better than themselves. The NTDP plays together year-round, faces adversity, grows together, overcome challenges when they get crushed by NCAA teams, they learn from their mistakes, etc. etc. This makes them a well-oiled and well-rounded machine come U18 tournament time.
On the other hand, CSKA (who had many NT players in the 80s) didn't have those same advantages. Yes, they played together year-round, but they never regularly faced competition equal to themselves leading up to the WC, CC, olympics. The entire season was an unchallenged snooze-fest. Therefore,, they didn't have the luxury of overcoming adversity, growing together as a team when they lost, learning from mistakes, etc. etc.
In many ways, the hot-housing methods of the Soviets were just as detrimental as advantageous.
Again, things aren't as simple as 'the Soviets were good because they hot-housed players'.