I took that to mean he voiced Scrappy in the original releases of these shows. there is a later dub where they try to make them sound like the American voices here: https://www.youtube.com/watch?v=8M6wIFsNnNQ Which isn't Mieczysław Gajda (I think it's Cezary Kwieciński, but i'm not sure).
The Polish wikipedia has this, i was going by the date of the show:
Yes he is "Cezary Kwieciski", also Scooby's "my nephew" WTF?!