I'm not certain from your question if you are saying Noel told you to play that particular note sequence (G, then d, then e) in that order with the left index finger, or if you are rather just saying that he has told you that you should normally use your left index finger to play those particular notes when you encounter them in tunes. I think you're saying that the former is the case and not the latter, but if it is the latter, that's consistent with his preferred approach to fingering. He prefers the use of the push-D rather then the pull-D. There are exceptions to that methodology, but it's a general rule.
If you're saying he told you to play those specific notes in the sequence you indicated for a particular tune, the fingering you described as your previous approach is the one I would normally expect Noel to use for that sequence. If Noel deviated from his preferred fingering and included a finger jump, there's a good reason. Without knowing more specifics, I can only guess as to what it might have been but I'll mention some possibilities.
While very unusual and uncommon, a finger jumping in order to play two notes in sequence isn't necessarily a bad choice in some circumstances. Much depends on the flow and phrasing of the music as well as the speed of the tune. There are sometimes chord considerations (note combinations available in a certain bellows direction) that might call for using a non-typical button combination, the phrasing of the tune might have a natural pause at the point where the finger jumping is called for, and if the tune is normally played slow, it might accommodate allowing for jumping the finger as an alternative to the normal approach.
You should be aware though that this jumping technique is not one you should train yourself to use as a default for the simple note combination you described, it is a very unusual approach. I think I've been to 15 class series with Noel and I can only remember him presenting one tune arrangement that called for the specific fingering jumping you described. That tune was presented in his beginning ("early") class and it was played entirely with the two index fingers. As I recall it was intended to build coordination with the index fingers and not intended to establish a default fingering. He did scale training and other tunes within the beginner class setting to establish the fingering pattern defaults.
If you'd care to send me a personal message through the forum I'd be happy to discuss specifics of the tune you are playing, it may be one that I've encountered from Noel over the years.