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No it's not infiniti, there was a predicted and calculated EOL.

The infinity sign was a nice way of saying your wrong.  There is no "predicted and calculated EOL".  Bitcoin may fail tomorrow or still be around in 20,000 years but there is no termination date built into the protocol.

TL/DR:
Yes.

I believe it had been calculated because of the deflationary component limit of 8 decimals...
maybe it was a subjective assumption?

Bitcoins wear out in approximately 5-1/2 years, then they have to be reminted.

bitcoin is getting more, not less. hence not deflationary. second, from time to time coins are lost ... some day in the future the supply of new coins will be less than the loss of older coins.
but

• this does never end at zero
• the 8 decimals are just how it is implemented right now. adding another 8, 16 or 24 digits after the comma is no fundamental issue, just a matter of proper upgrading all clients.

As long as Internet mesh networks etc. exist.

Bitcoins will not last for infinity. Only thing that is finite by design is the storage space available for blockchain. In physics and cosmology it is known that no civilization can acquire infinite amount of data.

But even this might not be a problem in far future. The biggest threat to Bitcoins are noobs and government. Geniuses create things, noobs screw them up in any imaginable or unimaginable way and then government steps in and put regulations on it. And this might happen long before all matter in asteroid belt is transformed to solid state drives.

As long as humans exist on this planet, that know how it works and use it