Really? You can pretty much always FOIA any records about yourself.

In the case of W-2 data, seems like you can get it as part of a transcript if you want it:

https://www.irs.gov/individuals/transcript-types-and-ways-to...

Of course, you also get a copy of the same W-2 directly, but it doesn't seem true that "they won't give it to you" if you ask them.