This just tells you the guy's knowledge comes from reddit, and the wrong redditors at that. A T-80U is still more modern than a Leo2A4, let alone a T-73B3M or a T-80BVM. And a T-90M has better thermals than a M1A2, for one.
One thing that gets me about these kind of commentators in general is that they adhere to this "old Soviet equipment meme." So yes, Russian armed forces are largely using Soviet-era armour, APCs, arty, etc... and upgraded variants.
What are they facing against?
The bulk of NATO forces is also Cold War-era designs and upgrades thereof. M1A2, Leopard 2, M109, Bradley, etc...
So Russia gets criticized for having so much 1980s equipment, yet that is also a large part of NATO land forces.
Where is the NATO tank that is a generation beyond T-90MS? Or even T-72B3M?
In fact, what NATO tank is T-90MS not a match for? What NATO tank cannot be defeated by a competent T-72B3?
They want to have their cake and eat it to: Russian army is full of "old Soviet equipment," but NATO Cold War-era equipment + designs making up the bulk of forces is not a problem.
We already know what it would look like if Russia deployed tanks as old as the 1970s-upgraded Vickers Mark III: it's called the T-62M. They are giving it to second-line units, a demonstrably-older design than T-72/T-80/T-90.
And LazerPig is using U.K. reserves as an example, saying that they have newer equipment. Okay, genius, how many tanks does U.K. have in total? How long before Ukraine would lose the equivalent of entire British tank force? They've already lost more men than the entire U.K. ground force.