Seems to be an informed opinion?

He's in the fortunate position of making money from his garden, can employ people to do the work and buy in loads of compost or whatever he uses to cover his beds. 

Exactly - he's a professional market gardener who supplies lots of businesses in his local area. That's a bit different from a full-time TV pundit who's being paid a fat salary to stroll around manicured borders waxing lyrical - or from us hobby gardeners who have to fit the gardening in around all our other responsibilities