Simple answer, your centralized database can go away tomorrow, or be arbitrarily modified. That can’t happen with the blockchain.
As an issuer, you do not have to worry about Hexel dissapearing. Presumably, the website doesn't make this clear.
The Hexel model doesn't seem to fix that. The issuer could still disappear, leaving the end user with a bunch of Hexel-tokens that can't be used anywhere.
For bonus point sight the backups with a PGP key and issue sha-256 checksums of your database (itself already containing previous checksums) this way you can call it a blockchain and get all the hype for free.
I don't say that the blockchain is useless, but it's hard to come up with use cases where it's clearly superior than databases.
The troubling case is the company hosting the DB shutting down, and therefore the entire system becoming worthless. This is what prevents you as the customer from trusting such a system.
Surely you can see there are some advantages of blockchain based tech then?
I would somehow think that the database technology is quite secondary to the creditworthiness of the gaming streamer when people decide whether to trust or not a token system of a gaming streamer.