Help Understanding an ID tag

[uwodahikamama]

So I have a question about an id tag on my orchid.
I attached a picture. From what I understand I thought it was Paph philippinensis Henry Walburn x a sibling plant of the same name.
Did I misread this? Someone commented that I misread the tag, that the plant is actually Paph philippinensis and that the clonal name of the sibling is Mem. Henry Walburn. But I’m not sure what that means? how exactly does Henry Walburn fit into this equation and if it isn’t part of the actual name of the plant then why is it on the tag??

Edit to add: in case the tag is difficult to read, it says:
Paph philippinense x sib ‘Mem Henry Walburn’