The second part of your text I'd classify as nearly textbook subjectivism ( https://en.m.wikipedia.org/wiki/Subjectivism ).
The first part is more complicated. If I recall that debate got kicked off by Descartes with cogito ergo sum, I think therefore I am.
Then Hume followed up with questioning if a stable self exists at all and later Nietzsche who stated that what we call "I" is only a bundle of instincts and enjoying that we are too overcome.
The English names for those teachings I don't know though, sorry.
A philosopher arguing for the complete non existence of self is not known to me and it would be hard for me to follow to be honest. To freely quote a whale: who is that I that does the thinking and asking anyway?
Edit: language
Not the person you asked but for me:
It's because they're a documentation mess caught in a release/stable discussion that I don't understand.
Perhaps that changed in the last year, haven't looked into them again since then - but unless there's a trigger (new server setup or official release for example) I simply don't have the time and energy to invest.