The tweet mentions completing the 'WAF Bypass – Exclude spaces' challenge on @YesWeHack. The challenge likely involved bypassing a WAF by excluding spaces in the payload. This type of bypass technique can be used to evade certain WAF rules that block space characters. The challenge completion indicates successful bypassing of the WAF. It is a good practice to participate in such challenges to enhance knowledge and skills in bypassing security measures.
For more insights, check out the original tweet here: