He's saying that in 25 years, you used only the LC and HE profiles, and didn't encounter TwinVQ even once. I looked at my thousand-odd MPEG-4 files. They're overwhelmingly AAC LC, a little bit of AAC LC SBR, no TwinVQ at all.

If you want to check yours: mediainfo **/*.mp4 | grep -A 2 '^Audio' | grep Format | sort | uniq -c

https://en.wikipedia.org/wiki/TwinVQ#TwinVQ_in_MPEG-4 tells the story of TwinVQ in MPEG-4.