I was a funeral director and got this question a lot.
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That's not how vikings had funerals. The only Norse who had that type of send off is Baldr, son of Odin, in Norse mythology. Real Norse were cremated or buried. Important people had huge burial mounds since they'd be buried with a lot of their possessions. In reality, if you burned a boat with a body on it, the result would be a charred decaying corpse floating back to land in a day or two. A ship doesn't have enough wood to completly burn a body and bacteria in decaying dead bodies produce gas which causes dead bodies to float.
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It is possible to "bury at sea" depending on the area. The Canadian government charges a significant amount for a permit to do so and it comes with a lot of conditions like a weighted and sealed casket and being dropped far enough from the shoreline. I've heard they make the process as difficult and costly as possible as a way to discourage the practice. However, there are no restrictions on scattering cremated remains at sea!
The meme is usually disapproval of something followed by approval of something that basically the same thing. The approval is of a CEO being murdered, but advocating violence is against the rules so the "approval" has been removed by moderators.