They discuss the typical patient groups that he is facing recently. So, naturally, this includes Covid-19 and long hauler patients. But I find it surprising that a single practicioner has a group of mold toxicity patients out of a sudden. I'm sure mold toxicity isn't such a common diagnosis that it can be considered usual. So I suspect that something changed in these patients that made them susceptible to mold. An alternative explanation is the lockdown and that this could lead to increased mold exposure, possibly building up mycotoxins during the course.
I am convinced that in mould patients there is some other issue going on, that either allows the mould to flourish or for it to do more damage. Otherwise why when several people have lived in a water damaged house does only one get mould illness? Maybe an altered gut microbiome, or a virus temporarily wrecks the immune system and allows the dormant mould to take hold.
Equally, in the case of Long Covid, it wouldn't surprise me at all if the mould was already there, in the gut or elsewhere and not causing any noticeable harm, but once the body is ravaged by Covid it subsequently allows mould to take over. One thing we know is there seems to be a link between Covid and Mast Cell Activation Syndrome (MCAS), which itself is very linked to mould/mycotoxin illness. Perhaps this connects the dots.
As to your point about lockdowns increasing mould exposure, it also wouldn't surprise me at all if this was a factor. I've long suspected our modern, warm, poorly ventilated domiciles have something to do with modern illnesses (not least the spread of airborne viruses) because they're such a relatively recent innovation.