they are the 3 he picked to use after moving to the new place.
There is no concern as to their length of validity.
If u r failing to connect either slush for absolutely no reason at all went thru the toruble to move off them which would make no sense but in the world of scary monsters makes tons of sense, OR they arewnt working like is happening the last few days, u move to another... and if none work
 a simple nslookup stratum.bitcoin.cz will tell you if something happened which is doubtful.