Can he use special abilities like capture and multiattck? I ask cause last update in the units section is 2004 so it may be outdated. If not, helloooo Master Mold!!

See the Sentinel rule sheet (pdf is availble for download in the units section here on the 'realms). There have been some tweaks/errata/clarifications (and they are in the PG), but otherwise their rules are the same.

So, yes, they can still use Capture and Multiattack.