Hmmm, well it played back just fine on my system, and that was even just in the preview window with spacebar...so if your concern is playing files that are this one you've linked, then you're fine...
That said, the solution I use is my Mac Pro 7.1 is for GPU INTENSIVE WORK. It absolutely smokes anything and everything that doesn't have minimum 3 RTX 3090's in it when it comes to GPU accelerated 3D rendering, which is about 60% of what I do. But then there's the other 40%...which is editing, and for that I use...well I still use my Mac Pro mostly lol, cuz it's damn good at that too, but when the footage is a codec that doesn't play nicely, my MacBook Pro M1 Ultra crushes anything and everything I throw at it, which pipes right into my monitors as well when needed for editing.
There's ZERO chance of me moving on from my 7.1 anytime soon, especially considering looking to the future, the RTX 4090's are roughly 30% faster than the RTX 3090's, which places my machine in it's current state "2 w6800x duos, 28-core" roughly ON PAR with 2 RTX 4090's.
THAT SAID lol...An article just released today where Mark German claims Apple had an M! Mac Pro ready to ship months ago but wanted to wait for the M2X to do it, and that a Mac mini Redesign is unlikely...SO...if they are going to allow me to bring my w6800x duos over to an 8.1 Mac Pro that is powered by an M2X but happens to play nice with MPX Module GPU's and can perhaps 4x my 28-Core CPU...yeah, I'll drop $52k on that day 1 for sure.
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