No I thought that but they said it was unnecessary. (There's not a little symbol for shrugging of shoulders!!). If I'm honest CLKD, it would be exceptionally difficult anyway as we have four climbers, five shrubs and some perennials in that bed. The spores will probably be everywhere now anyway. Interestingly, the trachelospermum were either side of a large pergola with a gravel and granite set path in between and both died. They were next to clematises, roses and surrounded by mature shrubs.
I've decided not to replace the trachelospermum or any other climber in the same position but have to attend to another shrub that's dying in that bed. There is a particularly tricky spot!