No, their first mistake was launching a military operation that depended on Starlink connectivity to a region that they knew was already cut off from Starlink due to sanctions on Russia on the assumption that they'd be able to convince an American company to turn it on for them in the middle of the attack, thus violating some very serious American laws preventing that sort of thing from happening.

I know the overwhelming narrative on the Internet is "Ukraine good, Elon bad", but in this case it really seems to me like the screwup was on Ukraine's side here.