No, I don't think it matters. If it was so important then why didn't Jesus pronounce it for everyone?
WT's obsession with the name and insistence on their preferred pronunciation is distraction to say the least. They claim it's use is mandatory for salvation and it has become a talisman, a lucky charm word for JWs.
Something is definitely wrong with this picture. Why does WT insist on this pronunciation?
Sure it distinguishes WT from other religions, but doesn't that just make Jehovah a gimmick, a sales hook for the purpose of brand differentiation.