Oh please.
It's taking about what one would expect aliens to look like. You can discuss the topic even if there's no evidence aliens exist or not, because IF they did exist they would still be subject to the same physical laws we are.
Just like you could talk about what kind of actions you would expect Lord Voldemort to take even though there's no evidence Voldemort exists, because you can project future actions based on the character that's already been developed.
Is the concept of "If this and this were true, what would be the result" so difficult to understand?
Just because they're thinking about how aliens might look doesn't mean they're saying "aliens totally exist".
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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