It's called The PhDiaries, link here: https://www.youtube.com/channel/UCrUXzINbyrxyDlm6Z3Ba2Jw.

Common topics I discuss relate to student mental health, work/life balance, my research (Mars rocks!), PhD applications, and general academic life problems. I usually post every other week, please let me know if there's any particular topic you'd like to see discussed!

It says this channel does not exist!

Yep man, same here. But I discovered it's just because we have to remove the dot (".") from the link at the end