It is a myth, in so far that there is some kind of time table for someone to make gains and magically, as if by the internet lifting god, they are gone. It doesn't work like that and it never has.
The people that perpetrate this idea are doing everyone a huge disservice and really, if you want to be dramatic about it, completely fucking up training by ignoring the physiological needs and the mental learning curve of programming/training as well as emotional/physical maturity.
While I understand someone wanting to "get shredded in 8 weeks" and can accept that turds "cut/bulk" or whatever Top 40 style of training is in for them this week - I can't accept them as part of any serious discussion with people who give a shit.
Again, as I like to say, you asked for my opinion and there it is. I'm sure most people disagree with me but luckily:
- I am ok with that.
- You aren't being trained by me, so it shouldn't matter to you.
I've have worked with enough people in my life to understand that training is much bigger than squats and deadlifts and jogging. If that's all people want it to be, than that's cool too. It akin to Amon Amarth, Lamb of God and The Black Dahlia Murder - it that is what people think passes as extreme music or heavy metal: that's fine for them but not for me.