Some food for thought can cause indigestion
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Oumuamua came from the galactic plane where it was at rest in respect to the rest on the galaxy, moving at the same speed as the rest of the galaxy - there was no out-gassing observed.
https://www.youtube.com/watch?v=BTkm3FLswJQ
Your guy is flat out wrong.
Sorry about your indigestion. But the object I3 Atlas is not Oumuamua; it is a completely different object in all respects, especially it size. and shape.
Thanks for the update. It’s a learning process.