Re: You vill parle Amrecianish Da!
Not even slightly true.
If you only looked at who speaks Polish or Irish as a main language then you'd likely be right, as most Irish speakers, use English as their main language.
But you stated speak, in which case even if everybody with even a slight link to Poland did speak Polish in NI (so around 35,000 or so people), that's still only about a third of those that speak Irish (at over 100,000 people). Numbers based on census data.
The original claim for this seems to have been from Arlene Foster a few years ago (DUP leader at the time), and was debunked at the time as being false.