This is why I can't take the shortened season Vezina that seriously. You see, the biggest contributor to winning a Vezina is showing you can handle yourself during the course of an entire, grueling season. 48 games are a significant amount, but the separation among the goalies - and the teams - usually start when you reach 60 games played and over. That's why GMs favour workhorses, those elite goalies who you can rely on to be there as a backbone for a significant part of the season.
Hence, which goalies do you find it likely would've been able to post great numbers while being workhorses who have to endure their own cold streaks and the teams' cold streak to a larger extent? If we would've played an entire season, it's likely at least one of this year's finalists would'nt have pulled through and some other risen up through the ranks.
Many goalies are good enough to post great numbers if they play sheltered minutes and don't have to be the clear #1. Only a few can. Some of the sheltered goalies probably can be workhorses, but until they've actually proven it, who cares to speculate?
So yes, I think the "flash in the pan" argument holds more merit now than during a regular season.