UK family of settled person visa

I am new to the world of UK immigration and just wanted some advice before we make a very expensive application for my Algerian fiancé to come and live with me in the UK.
I am receiving PIP so we are eligible on the financial side but I wanted to ask about Carers Allowance .
I have checked on the gov.uk website and Algeria is an exception to countries that restrict NRPF . It seems that Carers Allowance can be claimed by Algerian nationals before ILR is granted . If this is not the case then i wouldn’t be able to afford to bring him here so I dont want to start the complicated process and not be able to afford to see it through .
Many thanks
Minnie