I have mailed probono about this, but he has not yet answered. My guess is that a server needs to be restarted (HTTP error 403, which is likely not how you terminate a service). In the meantime, you will find the contents as CSV files at
[Link: github.com]Maybe somebody knows something about this but knows it by a generic understandable brand or website-related name. Could you add some hints?
irdb.tk is (was?) the website name.
Thanx for the link; a database of IR commands it is not, however.