rightwriter,
“Does anyone know about this note and can explain how they got this idea?”
They do anything and everything to try and prove the validity of their deity. They take pesukim out of context (or outright mistranslate them) and claim them as proof texts. In his debates with the Ramban, Pablo Christiani even tried to prove their deity from statements in the gemara! They consider a Jewish person apostatizing R”L to be a big win for their cause. So really there’s no big explanation needed for how they’d get this idea. They’ll find a statement, warp its meaning, and run with it.