He has urged people to support the political party For Britain both in a message on his website and by wearing their badge. For Britain are absolutely and unequivocally a right wing party. Slash taxes for the rich. Abandon foreign aid and any efforts to tackle the climate emergency, and divert these funds to increased military expenditure. Whether they are far right or just right wing is debatable but it is completely undeniable that he has now given his support to a right wing political party. Over half his UK fans have deserted him in the 18 months since. We'll see in 2020 whether they come back or stay away thereby probably ending his career. Until and unless he withdraws his support for right wing politics, my guess is that most of them will stay away.
As I mentioned previously I assume his support for For Britain is primarily based around their Animal rights stance and their position on immigration and cultural identity. I haven't seen him voice support for their economic, climate or defense policy for example and clearly you describe these from a left wing perspective. I would assume Morrissey's politics are more nuanced than left wing/right wing.
Morrissey hasn't changed and if fans have abandoned him that is their choice. Reports of the death of his "career" have been greatly exaggerated thus far.