"A lot of time"? "Failed to produce"?
Please, if you're going to comment, at least give opinions and not something that's complete nonsense and 100% verifiably untrue.
He got 84:02 of ice time with McDavid. He had 5.71 GF/60 with him, which is extremely high. He also got 4 assists in that time, which in turn is 2.86 p/60. McDavid's p/60 for the entire season is 2.89.
McDavid overall had 3.53 GF/60, so Puljujärvi increased his on ice production quite a bit. Also, McDavid had 5+3=8 in 84:02 with Puljujärvi, which is 5.71 p/60 - Almost double his average for the season.
NO ONE on Oilers produced better with McDavid per 60 minutes played in 5v5 than Puljujärvi. NO ONE.
So please do your research before posting next time.