Citing TIOBE instantly demonstrates a fatally bankrupt argument: changes in TIOBE ratings have essentially nothing to do with actual usage, or with anything else quantifiable.
TIOBE is statistical noise. You would equally meaningfully cite your tea leaves, or crows flying overhead.
Okay, well then I suppose you have a better citation for your unsupported assertion that Matlab has been in decline for many years. I've backed up most of my assertions with citations, I think it's time you brought some sources to the discussion. What is your basis for anything that you've been saying here?
I mean, if TIOBE was really statistical noise as your claim, there wouldn't be clear trends in industry reflected in the data, like the rise of Python in the last few years. And yet we see it, so clearly it's measuring something.
TIOBE is statistical noise. You would equally meaningfully cite your tea leaves, or crows flying overhead.