TIOBE basically searches a bunch of search engines and other things for "$LANGUAGE programming", applies some magical fudge factor and calls that a result.
It's absolute nonsense. It's highly manipulable if you can convince people to use the " programming" wording. It's going to be highly affected by the appearance and disappearance of documentation websites. It will of course still pick up ancient archives of stuff that nobody is actually using today.
I have an extreme skepticism of that VB is anywhere near the top 10. The original VB died long, long ago. VB.NET wasn't backwards compatible in the slightest and I don't think it ever had much adoption, because what's even the point? You might as well use C# instead. In fact long ago I had a VB project I considered transitioning to VB.NET and quickly decided it wasn't worth it, and went with C#. That was somewhere in the early 2000s, and I don't think it's gotten any more appealing since.