Ducky7, this is your first post and it is great to see new guys contributing to threads. Welcome to blonde. You have got some stuff wrong in your post, and I'll try to explain what is wrong with your thinking.
imo you didnt do anything wrong in this spot if you are deciding to play this hand, a lot of people have responded to folding the 10 5 however we are not raising for value in this spot but raising to put pressure on our opponents and trying to take the pot down in position?
It is clear that Pleno is 3betting preflop as a bluff, rather than for value. The key point though is that this bluff, whilst it will of course work sometimes, is not profitable. Pleno has not given any indicators in his hand history that this is a spot where bluffing with any two cards would be profitable. If he had given
specific reasons why he believes he can profitably get completely out of line at this particular moment vs this particular opponent then we could at least consider whether or not this bluff is profitable or not. But he hasn't given any such reasons. So there is no reason to believe that this spot is a good one. Randomly bluffing with terrible cards without specific reasons is not the right way to play profitable poker.
Plus we are playing the player not the cards

This is one of those poker cliches that sounds lovely but doesn't actually mean anything in this particular hand. Pleno has not given a single read on this player so we cannot be 'playing the player'.
Thanks for the welcome, and i had presumed he had information on the player, which would make this play more profitable even though he hadn't stated it, I guess i missed out putting that in my initial quote. However what you have said has been taken on board, when i was writing that i wasnt thinking about the play in the long run but about this hand specifically