What makes Troy Hunt any more trustworthy? Do you think he can't make a mistake? What if his operation suddenly can't handle something because of X reason? What if he's breached himself or any of the services he's using break down or worse, provide invalid data or incorrect data? What if user Y searches his site, finds out they aren't vulnerable due to a missed data dump or data dump that isn't been loaded yet, then all of sudden gets compromised? Who's to say his employees won't screw something up.
Troy is right. He can't efficiently do this anymore. From the architecture I've seen, all he's doing is monitoring a twitter feed for new data. What if that twitter feed gets compromised and he just ends up uploading password? If he's dealing with millions of records, there is no way he could "manually verify" if every record was safe to upload, yet he claims he does manually verify them without much elaboration of the process...
Imagine allowing legitimate companies to upload their breaches to the site or maybe other security companies could upload data. It could be so much more accurate. Plus the extra hardware could handle the load and help verify the data being uploaded much better than the current operation.