Steve Quayle who has been researching giants for a couple decades, has been saying for a long time, that giant skeletons have been found all over the world, and especially all over North America, and that they all have 6 fingers and toes. When they are discovered going back at least 100 years, they are all scooped up, and taken away, and never heard of or seen again. There are newspaper articles going back decades that document theses discoveries. His assertion, is that they are Nephilim. Goliath was a a family name, and there was at least two other giants besides the one David killed who were also giants, had six fingers and toes. This is not caused by "giant-ism" like the "Jaws" actor from James Bond or Andre the Giant" According to Quayle these skeletons also have an extra row of teeth. So I think the answer to the question is that they are suggesting Jesus was of the same ilk as the Nephilim!
My assertion is not that the Nephilim were not killed in the flood, but rather that at least some demons, sometimes... still "took wives for themselves" and had hybrid children...
As I have asserted before, I believe they found the threshold of how far they could push Jehovah before he pushed back. What they did before the flood was essentially an "alien invasion". That is to say, those rebel angels took it upon themselves to take very specific and directed steps to try to stop Jehovah from being able to fulfill the prophecy at Gen 3:15. So they "invaded" earth, by taking on the form of men, and taking wives and taking steps to eradicate Adam's offspring through breading by "angels". So since the flood they have continued doing what they did prior to the flood, if for no other reason than just push Jehovah's buttons. They are counting on Jehovah not to act until Armegeddon, as long as they don't do what they did prior to the flood.
So to depict Jesus as if he were Nephilim....
It is the ultimate insult to Jehovah to depict Jesus as if he was the offspring of a hybrid conception, rather than the way he was actually conceived. Instead, they depict the provision that Jehovah made by transferring the life of Jesus into a human being, in the same vein as the perversion of Angels having sex with women and then conceiving.
It is the ultimate blasphemy, and the ultimate middle finger to "God's Channel". They are mocking God and "his organization." They are saying, "yeah keep thinking this Org is God's channel you morons, but if you are paying attention, you can see it is not!"