It's just weird.
Start of the Season to January 1st the Penguins had incredible goaltending given some major defense issues that goalies bailed out and injuries and slumps to players like Rust, Rakell, Smith, Malkin, etc:
October 10 - January 1st
Jarry: 24 games played, Record 11-11-2, 2.47 GAA, .916sv% and 4 shutouts
Nedeljkovic: 11 games played, 6-2-2, 2.49 GAA, .924sv% and 1 shutout
Even Hellberg put up a very good game in his 1 game up during that span. For the first 35 games, this team was barely 2pts out of a playoff spot.
January 2nd - April 18th - Woof, both were awful.
Jarry: 24 games played, 8-14-3, 3.34 GAA, and .891sv% and 2 shutouts
Nedeljkovic: 23 games played, 12-5-5, 3.19 GAA, .891sv%
Jarry allowed 3 more goals than Ned in that span, but faced 28 more shots. Goal scoring the last 15 games for the Penguins went from near the bottom to the top 3 of the league, but goals allowed in the last 15 was brutal.
I mean what does it say when you go 8-4-3 in the last 15 but you allow the 24th worst goals against per game while having the 3rd best goals per game? I mean if you have some brain cells you know the Penguins didn't score much per game before that but were scoring enough to win games while allowing a f*** ton but scoring just enough to win those games. The PK was also brutal in that span. It's such a weird take to blame goaltending as one of the major issues, but something went sideways after January 1st.
It's an interesting time frame to the end of the season because the Leafs and Avs were worse than the Penguins for bleeding goals and weren't scoring enough, they were barely consistent as top teams heading into the playoffs.