Just using some common sense, mate. T-55's and T-54 have been out of service for a while longer than T-62's to the the point they were actively being scrapped with around left 1200 in 2015 waiting for destruction.
But hey, they are going to pull those few T-54's left out of storage, a tank which had components manufactured in Kharkiv to boot, instead of the thousands of T-72 or even T-62's just because thats something you do, even if there is no evidence of where, why and when they are being taken, just a twitter account claiming without evidence they are going to be put back into service in Ukraine.
I know you want this to be true and makes your job of spreading NAFO fud more bareable, but try to excercise some critical thinking. A few months ago, the "800 T-62M's" were all the rage and how the Russian army was going to be entirely comprised of them, yet we have seen an increase of T-90M in frontline service for every claimed T-62M and turns out the 800 refurbished tanks included T-72's and T-80's as well.
