Update: Mention of crossplay as a launch feature has been removed from Mortal Kombat 1's Steam page

Update: The mention of crossplay as a feature on Mortal Kombat 1's Steam page has seemingly been removed. Now, the page only lists single-player, online pvp, Steam achievements, full controller support, and in-app purchases as features.This is actually

Mortal Kombat (2011 video game), Warner Bros. Entertainment Wiki

Mortal Kombat 1 Removes Crossplay Feature from Website and Steam Page

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Shinnox on Instagram: Mortal Kombat 1 on PC will apparently support crossplay according to the games Steam page. This implies PC players would be able to play with PlayStation & Xbox players

Mortal Kombat 1 won't feature cross-play support at launch, and it's currently unclear whether the game will be available on personal computers at all. Gaming news - eSports events review, analytics, announcements

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Mortal Kombat 1 quietly removes crossplay feature from Steam page - Niche Gamer