It’s nonsense. The bedbug problem in the west grew out of trade with China.
La Lydia got the point by noticing that the writer implied DDT becoming ineffective which probably isn’t true at all, and at the same time concealing the fact that the probably effective DDT was banned, rather than becoming ineffective.
To me this is very effective and talented propaganda writing, it is ‘as smooth as butter’ writing.
“”But the commercial availability of pesticides like DDT in the 1940s temporarily halted the legions of biting bugs. As their pesticide-resistant descendants began to multiply from Manhattan to Moscow, though,””