This means that if the animal was found and scanned, and any of the databases contacted (such as Petlog) they'd direct the finder to Pettrac without even looking on their database,
That isn't how the "search"portals work, I don't know how much you know about the search portals, the the programming is designed to search the owning company's database first, eg Petlog & if the chip is recorded with them, even if it is a foreign chip or from a chip company that has it's own database & search facility(like Pettrac) the program will find it. If it isn't registered with the database it will search for a database linked to the chip number.
If you ring Petlog they don't just look at the number & say it's a database X chip, if it's a chip that wouldn't normally be registered with them. they run it through a portal search to trace it.