When I prepared my Tjader discography for Duncan S. Reid's book, I never trusted Lord. The Tjader data he displays are still the same as in the old Bruyninckx disco. He seems to have his people for some musicians, but others are shamefully neglected. I always check with other sources.
But, to be fair, it is impossible to get everything in such a project. Even in a discography on a single musician, you never can be complete. You'd have to audition every record to confirm every detail, which is extremely hard to achieve.
If he had a way of letting specialised discographers work on his database, similar to Wikipedia, that would open up a lot of possibilities.