I think it is meant to be more of a shine than a hair tint. Spider-Woman has often had some shine added to her dark hair by artists. It makes it look better with some panels than straight black hair does.
You could be right. I never took it as hair shine, but I'm used to colored panels so, that may be the case.
Visited NY and DC and saw Spider-Man Turn off the Dark.
Would Stark consoling him like that if it wasn't Peter ?
Would he necessarily even know if it wasn't Peter under the mask? Does Stark still know Peter's identity post-BND? I wonder because the scene with Spider-Man is the only one where everyone is in full costume (aside from Manifold, who neither Stark or Rogers really has a relationship with). All the other notifications are made with Stark, Rogers, and the recruits in civvies.