It's also so specific as to be inaccurate. These strings could be interpreted as "base-52", but also as base-64 or any other base greater than 52. Calling them "encoded" also implies a belief about how these were derived that isn't justified. "Encoded" means that there is some original source that can be recreated by decoding. It's possible that these were actually created by generating random numbers and then encoding that data in base-52. I think that's pretty unlikely, though.
So no, I don't think this sheds any light or additional detail. It's inaccurate and misleading and if we're so specific we're making up terminology, then we should also be specific enough to say things like "assumed pseudorandom" rather than "random" when we don't know. Otherwise we're just being obtuse.
'base-64' is at least a defined term with a defined alphabet.