In real football 5 red cards to players actually on the pitch ( so not counting subs who can also be red carded ) would result in the match being abandoned due to the requirement of a minimum 7 players , 1 of which must be a gk , to form a team. It is up to the authority in charge of the competition to deem the match a forfiet. This is different to a team failing to have 7 players at the start of a match which results in an automatic forfeit of the match.
In the case of t11 I dont know what the rules specify , maybe it hasnt been considered. I know the game doesnt always follow the laws of the game as written currently ie they use for convenience sake something that looks like the old lateral offside law from about 1980 but I might be mistaken as it could also be based on the first version of the newer offside law but it certainly isnt the current interpretation that allows passive offside until actually involved in play.