10 degree minimum

[Fredmax]

I was told by a commercial orchid grower last week, no orchid will die at 10c/50f, I understand many won't thrive but I'm actually referring to dying overnight or within weeks.

I'm debating this statement, although everything else he's said has been right. Am I being too careful with minimum temperatures?

Compounding this, I visited a local grower who had a greenhouse that was 2c the prior night and had a 5ft Vanda in flower, Renanthera, Aerides, Rhyncostylis, Bulbo sanguineopunctatum, and dozens of Oncidiums growing in a 12c maximum day?