I would try getting out of the moment and working on emotional regulation in the moment. This is helpful both for neurotypical children and neurodivergent children, so it doesn't matter that he's too young for any diagnosis.
Which basically means scrap most of the usual parenting advice.
Write a list of your current top 5 situations which are liable to cause a fight/tantrum, and write down what you would ideally like him to do (do keep it realistic for a 2 year old!)
This helps you notice when he DOES do anything even remotely in the direction of those positive expectations and you can go overboard with praise. You could also try a reward chart but he is a bit little for it to help very much. If you decide to do a reward chart, it should be temporary and specific (e.g. reward for holding hands, rather than for "being good on our outing").
Practise the expectations at separate, non-urgent times, make a game out of it etc. This can help a lot.
This is good with lots of similar ideas and more detail about how exactly to use rewards and praise etc: https://www.coursera.org/learn/everyday-parenting/home/welcome
Wherever you can, control the environment rather than the child. So for example, have a safe place where brother can put completed lego models where he can't reach them. Child gates on doorways might help especially if older brother has his own room.
Have a look at the book The Out Of Sync Child for info about how to help him regulate in the moment and spot signs of dysregulation in general.
Definitely speak to GP or health visitor and get any screening done for speech and language, hearing, development etc. If there's a simple cause then it's worth ruling out. You might also want to do the M-Chat screener for autism. It's difficult to screen toddlers for ADHD, because a lot of the questions aren't expectations made of toddlers anyway, but he definitely sounds like he's having trouble with emotional regulation, impulse control and frustration tolerance, more so than the average toddler. (And yes, they do all struggle with these things but yes, also, this is more than average).
It sounds like you have enough recordings - I would stop now as it is likely just making you stressed. You have enough to show any professionals who might be able to offer help/advice.