I don’t know but he may have been trialled in a hyperbaric oxygen chamber (like that used for treating divers w bends). This is being researched - theory being high level oxygenation of blood prevents the dropping of oxygen which can intermittently recur with Covid patients post acute phase , is anti-inflammatory and (studies are being undertaken on this) can it actually reduce viral load.
Long Covid in UK is a very significant issue. Many very ill people were not hospitalised early on in the pandemic..but treated at home.
I was logged in on a webinar in London w a specialist physician recently (who haS long Covid) and numbers are huge. Treatments are aimed at organ involved/physical rehab as lung/cardiac/nervous system effects can be v disabling. I don’t know of any ‘special ventilators’ .. Shane must be very special.
My understanding is this is part of ongoing research..