I don't think so, but hey if you can pass a certain level and still be under the rules while solo, you should be good to go!
Sorry for the late response dude I've been super busy lately. Technically speaking, if you were able to do this on a Valve server by filling the other 5 slots with 5 idle accounts, or having friends of yours idie...then it's not against the rules or anything. There were low mann categories not so long ago for speedrunning missions with only 2 players, but the servers needed for those have been gone for some time now. Even if the 1 player time you achieve ended up being the 150th place time for example, providing all the neccesary rules have been followed then there's no reason why I couldn't accept/verify it technically.
