They have been warned and they stopped it.
Anyway you are not banned for simply spawncamping:
<~hotdogcat> !baninfo =F2=KilleR_FrosT
<~VW7_Staff> Player ID: [144], Name: [ =F2=KilleR_FrosT ], Admin: [ [VU]Hotdogcat ]. Reason: [ continuing to throw grenades on spawn after several warnings ].