Methods Business and Digital Technology Software Engineer interview questions

Naggy recruiter, phone screens, panel technical interview, then hard ghosted; left on read for multiple messages. Total waste of time and highly disrespectful given the effort put in and initial incessant calls from the recruiter. They couldn't even be bothered to justify their position or give any feedback confirming the rejection (for all I know, I'm still waiting for the 'next stage'). They expressed a lot of concern about my ability to get SC, despite me having held it previously. It's the lowest level of government security clearance, which I'm assured by people - actually in the industry with higher clearances - would have been fine in my circumstances. Maybe they are racist sinophobes, which is ironic given the recruiter was of east asian heritage. Didn't Sun Tzu have something to say about knowledge of one's enemy?