Superdry are in a mess financially. They're heavily indebted and the share price has plummeted. They've been selling off assets to try to improve their balance sheet.
This is the legal equivalent of a sting from a dying wasp.
Also, in 2002, Asahi filed an objection to Superdry using that name. That failed on the grounds that the brand name Asahi was used, which enabled the two brands to be distinguished. The word 'Asahi' is very prominent on the training kit, so it's hard to see how this action will succeed.