I was in a similar situation to you growstuff, in that I was also retired but not on a SP, vulnerable but not clinically so, and my university work dried up. As I am no longer salaried but work on a consultancy basis I am paid for hours claimed, but they reduced to almost nothing until remote learning got into its stride.
Meanwhile, I was doing a 'recreational' MA at the same university (different subject obviously) and we students got no reduction in fees, so they 'clicked' both ways - charging students but not paying a lot of staff. I was paying full fees with no student loan, as I already had qualifications at above Level 7, but I had no earnings to set them against, so my savings took a further hit. I was living on savings anyway, as I had no pension.
Luckily, Mr Dog has a decent pension and we share resources anyway so I wasn't going to starve, but I agree that the much vaunted help didn't go to everyone. My sister got full furlough because she was office-based and on a regular pro-rata salary. As you say, I don't begrudge her (or others) the help, but it wasn't evenly distributed.