Had my Round 2 interview with Deloitte on 7th May, but no update yet. Does silence mean rejection?

Check status in portal

Maybe contact the HR? He must have had a feedback by now

Yes

Deloitte Hr / talent team are trained to be silent and showcase they are super busy, even for campus hires they wont open their mouth. Forget about everything even for internal employees they dont respond on teams, they are busy than partners .. MDs