Looking for info on world record jet aircraft

I'm looking for *verification for a claimed Guinness World Record for
World's smallest jet aircraft. A BD5.

The link on the Guinness site has not worked for months. I have
contacted them, and through email exchanges, their representative has
indicated they have no knowledge of this aircraft

The person claiming the record, a guy by the name of Juan Jimenez, has
informed me that the reason I cannot find the record is because I
"have the IQ of a pin", and do not know "which database to search".

I am quite sure I have searched the "correct database", and reasonably
sure the people at Guinness know their own database and how to search
it, but the final response to detailed questions about this BD5 is
that they have no knowledge of it.

Can anyone in this forum shed light on this discrepancy?