Not sure what you're actually asking here. The screenshot looks like classic realist/denialist interaction, without context it looks like the attack is correct based on the suspicious defensive behavior on the other side
Discussion
Is it possible for a node to censor a transaction if the node don't know who send to who nor the amount ? Maybe the node can block every transactions but I was thinking it's impossible to specifically target an address ?
Not sure, I don't 100% trust Monero's privacy myself
No. Miners would need to do the censoring.
Thanks to its encryption Monero is less effected by a 51% attack as well as P2P pool basically guarantees that transactions will get through.
The only thing state actors could do is control the mining network (maybe 80%) and mine empty blocks slowing down the transaction throughput.
But thanks to the dynamic blocksize algo this will penalise and self correct. Especially when financially broken states don't have the means to pay for mining disruption and price suppression any more.