Upvote:6
Hard to tell, but I'd guess the people involved would notice the quite different size between the T-34 and T-54 production models (the T-54 is about 50% longer than the T-34).
Czech production according to Wikipedia started only in 1957, this document is from 1954, predating that by enough time that it's unlikely to have been account of a pre-production run.
What may have been described could be a local attempt to fit a larger gun to existing T-34 tanks that was not successful. The Soviets had tried that already with a T-44, itself basically an upgraded T-34, several years earlier and also given up on it. 2 vehicles were fitted with a 100mm gun, a development that inspired the armament of the T-54. The Czechs certainly had Su-100s, from which the gun could have been taken for fitting into a new turret to be equipped on the hull of a T-34-85 as a stopgap until T-54s would roll off the production line.
As I can't find any information about such a hybrid in service, it's unlikely the modifications were successful.
I did find a reference to a Czech T-34-100 in the computer game World Of Tanks however, which often includes obscure prototypes and paper plans as vehicles. For example, one blogger talks about it here (with a 3 plan drawing of the vehicle): blogpost
Most likely your document talks about the conversion of a test series of tanks for this program, which used existing T-34-85s and fitted them with 100mm guns taken from existing stock of guns for Su-100s.