I usually start with Wikipedia ... many folks (humans) verify Wikipedia ... but, for the most part, you are on your own to verify the content of any AI tools (and you most likely might head to Wikipedia to start that process).
Wikipedia has TurboBasic/PowerBasic page(s). Nowhere in the history of TurboBasic/PowerBasic/Borland, as relayed in Wikipedia, was there an OS/2 version.
Also, nothing on archive.org ... a second place to investigate. If ever there was a version, it usually makes its way here.
Finally, the forum might be a place for further inquiry:
forum.powerbasic.com/
Borland had a few OS/2 products, but I can't find that PowerBasic (or TurboBasic) was one of them.
Hope this helps ...