Yes we are assuming he has actually complained , the anonymous source of the article is telling the truth and so on.
The original piece was in The Times on Saturday, here's an extract:
Those in contact with the prime minister, both friends and colleagues, say he is finding
aspects of the job extraordinarily tough. They are concerned that Mr Johnson’s longstanding tendency for dark moods is being exacerbated by the pressure he is under.
On the personal front, they say, Mr Johnson, 56, is worried and complaining about money. He is still supporting, to different degrees, four out of his six children, has been through an expensive divorce and had his income drop by more than half as a result of fulfilling his lifetime ambition.
As a backbench MP, with his
Daily Telegraph column netting him £275,000 and lucrative speaking engagements, he was earning well in excess of £350,000 a year. His prime ministerial salary of about £150,000 might seem perfectly sufficient — but that is not what he actually receives. His use of the flat that he shares with his fiancée, Carrie Symonds, above Number 11 is taxed as a benefit in kind. Any food sent up from the Downing Street kitchen has to be paid for and if they want to have friends to stay at Chequers — Covid restrictions permitting — they receive a bill from the government.
As one friend put it: “Boris, like other prime ministers, is very, very badly served. He doesn’t have a housekeeper — he has a single cleaner and they’re worried about being able to afford a nanny. He’s stuck in the flat and Downing Street is not a nice place to live. It’s not like the Élysée or the White House where you can get away from it all because they’re so big. Even if he or Carrie want to go into the rose garden they have to go through the office.”
https://www.thetimes.co.uk/past-six...s-face-boris-johnson-gets-the-blues-r9jl63m2q
One thing I do have sympathy for is if he is suffering the after effects of Covid-19. I have close work colleague who contracted Covid through their spouse who worked in a care home, was laid low for a week and still now four months later can be fine one day and unable to get out of bed the next.