That emphasized line is typical when someone wants to ban something but doesn’t have any proof that it’s actually dangerous. See the US government and conservative’s reasoning for keeping marijuana banned or the federal government banning vaping (while allowing cigarette sales to continue). In both cases the weak justification for the bans are “we don’t like this stuff and there’s not enough research proving it’s safe!” Meanwhile they try to hamstring anyone who wants to conduct a study unless the objective of the study is to bolster the ban.