You just don't say someone may not "ever" lose again.
If you take out the "ever" and simply write:
"South Aiken may not lose again. They are very talented."
Then you have a phrase that is slightly less ridiculous, but still a major bullseye on a team/coach.
Better to just write:
"We showed all we had. SA is very talented."
This abrogated phrasing of your post allows you to heap praise on South Aiken, while also hinting that North Augusta is a strong team. There is nothing tongue in cheek about such wording either.