Ironically, Polish, by comparison to some other European languages of comparably-sized nations, is very uniform and devoid of dialects / regional accents. There are a small few regions that speak a proper dialect (not mutually understandable with regular Polish speakers), but otherwise, with minor exceptions, you cannot tell at all where in Poland someone is from based on how they talk.
In the UK, by contrast, this is still a big thing. I believe German dialects are very diverse, heck, Dutch ones can pinpoint people to a village sometimes. French had very diverse language base before Napoleon. Spain still has regional languages that are very much alive and in use, Italian accents (dialects?) are too quite distinct.
Maybe Poland is compensating for this here, by inventing whole new languages?
EDIT my bad, the article mentions a Pole, Marta Krzeminska, but she is not the language's creator. It was a Canadian who created it. Oh well.