hi kushti, sorry for the delay, I just posted an answer

They can't. I debated them about it in the other thread, there is nothing new to prevent grinding attacks.
Jonald, it's very dishonest of you to imply you proved any point in our discussion.
If you want to have a
constructive debate, please provide a detailed description of the attack you think is possible: how many coins you own, what attack are you attempting (e.g. how many blocks you want to reverse), what are the different step of the attack etc. I'll be glad to give you a detailed, clean, step by step answer (with the maths) to prove to you that it's impossible and why.
Otherwise it's just you saying "I'm sure it doesn't work" and I can't possibly provide a counter argument to that.