FWIW Nick Lowles isn't "far left". If you follow HopeNotHate, he reports on all kinds of extremism - far right and far left.
There are always accusations of "false flag" actions. I have no idea whether the list published was "false flag" or not. However, to make it clear, it's highly unlikely to have been the government behind it, but the government could have been the indirect target.
Extremists always know how to trigger extremists opposing them. In this case, the groups behind the riots would know that threatening mosques would bring out Muslim-supporting groups. Neither side has much faith in the police to keep order, so they take matters into their own hands. Nick Lowles and HopeNotHate are against such actions, which is why their message is always against extremism.
I don't know whether this was deliberately false flag or whether people have been deterred by the swift sentencing of people involved in previous riots. I tend to think that the "list" was genuine. It would certainly be consistent with Farage going round in a chauffeur-driven car pointing out hotels where asylum seekers are staying and the kind of actions Tommy Robinson (and others) have been involved with when they have targeted mosques.
The ultimate aim is the undermining of authority and a breakdown in law and order by creating chaos, confusion and fear. The hope would be that the police would be overwhelmed and the judiciary and prison system wouldn't be able to cope. Starmer and the government have shown that, so far at least, this isn't happening.