Are you serious?
Sure
How could I have a proof for this?
No, I don't have proof.
I didn't talk to you about evidence, I asked you for some data, for some indication, if you prefer.
You should know that what people say is not necessarily what people think. Especially what personalities say in public is what suits them best, not the actual reality.
I know that. But what they say is not necesarily false either.
Do you have any other idea why would somebody who has no business with Bitcoin, somebody whose business is a competitor of Bitcoin, post so much about Bitcoin (no matter it's always negative, it still posts a lot)? Why such a person spends so much energy talking about .. the competition?
Simply, because he really believes bitcoin is a ponzi and that it's going to go to zero in the future.
There is a principle known as Ockam's razor, which is simply that the simplest explanation is usually the correct one.
For someone to say that bitcoin is a ponzi and that it is going to go to zero, if we have no other data to back up that they are lying, to think that they are lying and that they actually own bitcoin is not supported by rational arguments.
If we take this reasoning for granted, we would also have to take for granted that those of us on this forum who talk about owning bitcoin do not actually own it and are on this forum talking about it to mislead the Treasury of our countries, or some such conspiracy.