Since you can’t be bothered to read their debate, I’ll summarize:
—Why would they reprint already published archetypes in Xanathar’s?
—There’s no great reason I can think of except the AL’s PHB+1 rule. Those archetypes must have been popular and they want AL players to have access to both those archetypes and new material like spells and races found in Xanathar’s.
—That feels like a lame reason, but you’re right, it’s the only remotely good reason I can think of for them to reprints those archetypes. But were those really that popular? Wouldn’t the spellcasting archetypes benefit more from the new options than the non magical ones?
—Yes. But they didn’t do that and nobody can figure out why.
The end.