What is the source of this information? My vintage edt is wonderful, a dreamy heliotropin-floral combo just veering towards nutty edibility but not falling into gourmand territory. Very serene and atmospheric, for lack of better words.
I don't have extensive experience with different edt, mine was in the "blob" bottle. Nor have I smelled vintage parfum, which I suppose, as with most Guerlains, is even richer.
The wisdom I have heard is that HB changed after 2010 or so with the IFRA restrictions, since at least two of its key ingredients, heliotropin and eugenol, are now severely restricted. The current version smells more spicy and floral, and lost its peculiar feel. Any vintage, I bet, is superior, unless you are interested in the "penis" celebratory bottle the reformulated HB came in for its (post-mortem) centenary.