This is another case of an "expert" not taking everything into account. Just like the one who claimed that bumble bee wings couldn't fly.
Pterosaurs had hollow bones, aerodynamic skulls and, more to the point, wings. They ranged from sparrow sized up to the largest winged creatures that have ever existed, with a 12 meter wingspan. They were incredibly successful and survived for millions of years. You don't do that by being badly designed.

Expert... PAH!

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