Noo, he's been a sloppy shit for ever. Pre covid. I'm sure two kids and a pandemic doesn't help but really, he's just not got the vigour needed to understand the job. I read his aides couldn't keep him focused on any agenda at meetings, he just wanted banter and then to walk off.
I also doubt he was really that ill with covid, he was back working in downing st within about three weeks whereas the average intensive care patient is barely out of bed by then. I think he was a bit ill and it was stage managed because he wanted a trump superman effect.