No one is saying that examiners should apply their own unique interpretations to the rules; they are pointing out that it is the examiner's responsibility to ensure that the claimed hours are flown in the appropriate class of aircraft. If they are satisfied, the hours count.
State of registration is irrelevant, homebuilt or factory built is aso irrelevant. Even hours flown in what the UK CAA would call 3-axis microlights count, so LSA hours are also acceptable.