No, no data. If there was any data we would actually know the "sold" prices of condos that you actually sold for, like in any civilized country.
That being said, if you bought The Base in Pattaya (which is an AirBnB central) it is possible to make a profit, especially if you bought during preconstruction or during pandemic.
I am more familiar with Bangkok. Lumpini Makasan precon price started at 3.5 million which means the smallest room on the lowest floor (Studio 23sqm). Today I can get the cheapest room in this project on 24th floor 27sqm for 3.25 million, probably lower with negotiation. This building is what.... 4-5 years old? So, for at least this project that seems to be a lie.
Oh, and even if you were flipping these not so desirable condos the fact that you supposedly sold them in a short term would trigger quite a bit of taxes at the land office.