In the OTC market, Form T trades are mostly the result of accumulated buys or sells handled on a not held basis by block desks, otherwise known as "late prints." They have nothing to do with short-selling.
Notice the word "mostly". I take that to mean maybe once in awhile T trades might still be used for dilution.
If you read the whole I linked about T trades you might get a better perspective on the use of T Trades since the SEC (and FINRA) tightened up some of their rules.