Obviously the word of a representative on a trade stand is not gospel and I would never take it as such. With equal respect, if a manufacturer temporarily withdrew supply of cars to the largest leasing company in the UK, logic would say it was to cool demand rather than because they were not selling enough. If, as claimed by said rep, they return next month then logic would again back it up.
If demand for a vehicle exceeds the limits of what a manufacturer first thought they would shift to Motability, the manufacturer will remove it from the scheme temprarily or permantly. Not because of overall market demand is too great, but rather the manufacturer is selling at a loss to Motability. By removing it, the manufacturer can renegogiate the value of the vehicle with Motability and put it back n the scheme, with an higher AP, similar to what Skoda has done with the Elroq recently.