That is correct, but it’s always important to make sure the “randomly chosen” bit is close to true, which is usually true (and verifiable if the methodology is accessible) in electoral polls and such, but I would hazard a guess that this is not as obviously the case in a country having a civil war, specially with an agency that goes out of its way to call one of the positions as “Russian propaganda.” Their overview on methodology doesn’t mention in which regions the polling was made and their (google doc) source is in Ukrainian/Russian and I can’t read that.

But yeah, in general people are often too quick to dismiss surveys because of sample sizes that are unintuitively small.