I would say that Scoffer's statement is a fact based on current Australian and New Zealand gun laws. Ownership of semi automatic weapons was severely restricted in Australia in 1996 after the Port Arthur Massacre. There was a generous buy back scheme to get "semi autos" off the market.
These weapons would be extremely difficult to acquire in Australia and have to be obtained illegally at a considerable cost. "Professor Simon Chapman said a similar attack could only occur in Australia if the perpetrator was able to obtain “totally illegal weapons bought off an illegal market.”
This is not the same in New Zealand where gun laws are similar to those in Australia prior to 1996 and "semi autos" are available in gun shops.
"The sale of normal semi-automatic guns is not restricted in New Zealand. The same weapons can only be acquired by licensed professional hunters in Australia, and must be individually imported."
"Under Australian law, all guns must be registered to a licensed-gun owner and automatic and semi-automatic weapons are banned."
https://www.theguardian.com/world/2019/ ... ic-weapons
Christchurch mosque massacre: Why PM Jacinda Ardern could follow Australia's gun lead and ban semi-automatic weapons https://www.nzherald.co.nz/nz/news/arti ... d=12213320