"Not very safe from the perspective of pax and crew."
"Not very safe" is the usual exaggeration of the risk the virus poses. Not much different than the risk anyone flying from the U.S. or the Philippines faces just being out and moving around in the U.S. or the Philippines.
I haven't seen any sources showing there's a higher risk aboard an aircraft. Indeed, while there have been several cases of flyers testing positive on arrival in Hong Kong, I don't recall one single case where a fellow passenger tested positive a few days later.
There has ben many cases. Lots of them. That's why they require quarantine on top of test on arrival