It's an excellent, detailed article, evidenced from lots of sources.
The Russian who recruited the arsonists called himself "EL" but is potentially Evgeny Lyukshin, son of a Russian diplomat. Not least because he couldn't stop himself boasting about his connections...
The article describes activities EL paid people to do or tried but failed to get recruits for.
These included spray-painting anti-Islam slogans on mosques, painting a Quaranic verse on a Conservative Club, and putting up by a mosque an anti-Muslim poster designed to appear like it had been written by a Hindu. Very detailed instructions, to make sure they got it right!
At one point he tried to hire some Bristol graffiti artists for this stuff. Unsurprisingly, they, er, declined his kind offer!
EL set up astroturfing entities to carry this stuff out, including "Takbir Foundation", a fake Islamic jihad organisation, and "Direct Action", a fake far-right organisation.
So all absolutely standard Russian disinformation and provocateur stuff that we've been seeing for the last ten years at least.
They do like their hybrid warfare: fake organisation, social media messaging, paid grunts to do real-world actions when they can't wind folk up to act for free.