A politician can spin it that way sure, despite foreigners owning 0.12 percent of property and most foreigner jobs (at least the ones my friends have) requiring fluent English. It's not a threat to Japanese people, but with the right populist figure, anything can sound like a threat. What I find so sad about this is the lack of empathy for people that worked hard to build a life here, paid their taxes, and followed the law. They did nothing wrong, but are the targets of a population primed to take their economic woes and anger out on people simply living their life peacefully.