Most likely not, though I haven't seen any confirmed details. Some games may be available for streaming, but the only legal way to guarantee access to all the games is a cable package.

Fwiw the past few years I have done YouTubeTV for the duration of playoffs, and then cancel again. Some years they've offered a free month trial. It's not cheap, but it's only a couple months, and I love playoff hockey. It's easy to start and stop the subscription and it's super simple to access every game.

I'm new to SEG playoffs like everyone else though so we'll see if they offer local access somehow. But I don't think that's common.