What a weird way of reasoning. So, you hold it against TheFlow that he participates in a program that allows him to release his findings to the public half a year after the exploits he found have been patched, which he doesn't even have to do...
It has never happened to me, but I have occasionally seen it reported by other users.
It is possible it is related to being on 4.5 and the offsets are not properly set for that version. The most common versions are 4.03 and 4.51 so consider...
Correct. It is jailbreakabale, though I would update to 4.51 if I were you.
I recommend not connecting to the internet and to run the exploit locally on your PC connected via ethernet: https://github.com/idlesauce/PS5-Exploit-Host
It will work...