I'm a little confused as to how you seem to be interpreting what "tunnel of love vibes" means for Disney's implementation.
By nature of being a dark ride in a boat on a pier it will be a part of the legacy of Tunnel of Love, Old Mill, river cave attractions - full stop. That doesn't mean it needs a giant heart facade to walk through or overtly romantic show scenes, it's just what it is, debating past that is sorta semantics.
Personally I love the concept for voyage into the world of Coco through a modern tunnel of love on Pixar Pier. I really hope they go nuts with the blacklight accents, projection-mapped "2.5D" backgrounds from Runaway Railway mixed with more practical sets and AAs.
Is tangled 6 minutes? I think it's more like 5 minutes of actual ride content not counting being stuck behind other boats at the beginning or end. Tokyo Disney's official website seems to agree:
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In any case, I'm curious what songs/music Disney selects for the ride and how long each one will have. Top of mind:
1. Remember Me - bolero-ranchero ballad at first, then a lullaby - will we get both?
2. Un Poco Loco - Son Jarocho folk music, almost sounds like Flamenco, would be a good song for a large gathering/party scene
3. La Llorona - a real Mexican folk song from Day of the Dead
4. Proud Corazon - song for finale scene/exit music?
If each of those had a minute of song/scene, plus one minute of transitions that's already 5 minutes. Hoping we can get more!