I don't know exactly waht is he claiming. Hallachic status of a person is not the responsibility of the State of Israel, but of the Rabbis. So the State has two options regarding converts outside Hallacha. Either they accept them as citizens just for feeling a part of the Jewish People without taking any stance about their real Hallachic Status (Just as they accept Gentiles who are kins to a real Jew, but in case of conversions, it would be a bad measure because any Gentile could get a non-Hallachic conversion just to enter Israel) or they accept only converts by Hallacha under the Law or Return. Once they accept a convert through the Reform, they cannot make an exception just to exclude gays, since Reform converts generally don't pledge to keep the mitzvot and, under Hallacha, it's the same if he violates the Law against homosexual acts or the Shabbat.
But if this man is claiming the "right" to "marry" another man, or to make alyah because he has a sexual partnership with a Jew, then he is really mad.
Now, to the ones who posted.
TakeBackOurTemple: The plagues in Egypt were mosltly a punishment for their cruelty to Bnei Israel, not specially for sexual misconduct, though it seems Egyptians were doing also sexual misconduct as well.
JTFE: No, he seems to know very little about the Scriptures. He is claiming that a person can be accepted as a Jew just because he wears the "right clothes" and don't have plural marriages. In fact, there is no Hallacha telling a Jew what kind of clothes he must wear ( traditional ethnic clothes vary... Sepharadim, Ahskenazim, Mizrahim) and polygamy was allowed in tha past. But there is an Hallacha saying that a person must pledge to keep all the Mitzvot to become a Jew, and abstaining from same gender sex is one of the 613 mitzvot.