Looks like they are back in it? 3 points out currently.
They definitely are, but it's still a really difficult hill to climb at this stage of the season. If the Flyers and Caps go 0.500 in their remaining games, they'd be at 90 points. The Penguins would need to go 5-1-1 just to tie one of them in points. Also, every game the Penguins have left is against a team above them in the standings, but only 3 of them are against other teams in the WC race (Washington, Detroit, NYI). Their other 4 games are Tampa, Toronto, Boston, Nashville. IIRC, that's the most difficult schedule among the teams in the race.
At the same time as doing what they need to in their relatively difficult schedule, they'd have to hope the Red Wings also don't play over 0.500 in their remaining games and that the Islanders do worse than 4-2-1.
The likelihood of all 4 teams performing poorly enough to let the Penguins get in isn't high. Is it impossible? Absolutely not. They just need a lot of help from other teams dropping games.