I am struggling to picture this - there is no indication this Architect was the person's manager. The manager is the one who should be the one giving feedback

I am struggling to picture this - there is no indication this Architect was the person's manager. The manager is the one who should be the one giving feedback based on observation and evidence and not just gut feel. Onboarding takes time - especially at bigcos the stack is so inhouse and complex no way even the most senior person (this person didtn seem so) takes atleast O(weeks) if not O(months). Even if the architect had some authority (and evidence) to provide feedback this just looks like a prison ritual of intimidation/hazing. How is this acceptable? Also (and the OP could be hiding info) there doesnt seem to be any indication of this being a cultural issue - unless the OP did something so in-your-face illegal/offensive. Again the point is not to dissect what the OP did/did not do but really - what happened to welcoming and being kind to your colleagues?