Absolutely that. I know who it is but believe me that is totally wrong. It's was obviously no problem to Jimi playing his style of music, but if you want to play other styles, you'll never do it with your hand like that.
You might not want to play music like Cavatina, but you'll struggle to play more complex chord shapes and the more demanding parts for your fretting hand if you strangle the neck like that. Watch John Williams as an example
it’s all down to personal preference and style (John Williams classical- thumb on the back of the neck).
I’ve been playing guitar for 26 years and for the most part my thumb rests on the top of the neck. If I want to play a particular stretchy chord, I’ll shift my thumb to the back of the neck.
Practice is the key. Discuss what sort of music your into with your tutor and once you have the basics down you can start learning a tune you like. Keep it interesting.