"‘personal data’ means any information relating to an identified or identifiable natural person (‘data subject’); an identifiable natural person is one who can be identified, directly or indirectly, in particular by reference to an identifier such as a name, an identification number, location data, an online identifier or to one or more factors specific to the physical, physiological, genetic, mental, economic, cultural or social identity of that natural person;"
I guess interview notes would fall into this category as well.
it's related to a identifiable `data subject` and related to his traits. e.g. "John Smith is bad at math and he hates pencils"
No. Under the GDPR they will tell you that they stored your name and surname (as in sentence "John Smith is bad at math and he hates pencils"). They will not send you the sentence they will just inform you that they used your name in it. If you ask them to remove your personal data then they are obligated to remove your name from that sentence but that's it, the sentence can stay because it doesn't says who hates pencils, it's just says that there is a person that is bad at math and hates pencils. It's like me saying "A white, old guy who was US president sent me a letter", it describes quite a bit but it doesn't identify anybody even thought it narrows the list quite a bit.