Not great quality images so a bit hard to say but the signatures look like good late examples. I actually prefer this type to the more common earlier ones.
You can tell if an autograph is likely fake from a small or low quality image. But you can't tell if an autograph is likely genuine without a large, clear image.
You can't reliably authenticate autographs from the images like the ones posted. If you think you can you don't understand authentication.
I have looked at these long before the discussion here. Didn't see any problems with these then nor do I now. I have even purchased a Hepburn from them awhile back. No complaints from me.