And upon such time that Iran starts killing Israelis by the tens of thousands, we can give Iran's messaging equal weight.

Nearly every neighbor of Israel has made statements of this type over the years, and yet, none have been in a position militarily for any such statements to amount to more than hot air.

Israel is a bad guy in a sea of other bad guys, but currently, only Israel is carrying out a genocide.

Iran both lacks the capability and has been heavily sanctioned for decades for their actions.

Israel is in no way analogous to Palestine. It's a synthetic state created by European colonizers in 1948. Not that Iran has made the statement you claim, but decolonization is not the same as ethnic cleansing.