Probably because he's wargaming how to attack upstream from the people hosting Null's various proxies.
View attachment 3696956
He previously tried to cajole APNIC into dropping Null's allocations, but was ignored at the time, so now he's working up from the other end. Can't get the hosting, so he's trying to get their upstreams to disconnect. If that doesn't work, he'll try and get other network peer organisations to de-peer from those upstreams. That's where things get stupidly dangerous, because mass peer-blocking at that level potentially causes ruptures in the backbones that keep the internet functional. He's more than willing to break the infrastructure at a fundamental level, just to get Null deplatformed.