Harbor effectively has one smoke that's on refresh compared to other agents with two smokes. The refresh may be fast, but it feels fair given how his util is much less compared to other agents. He's definitely a lot stronger and will invite people to use him as a secondary smokes, but definitely not strong enough to be a solo smokes player.
The ult buff is monumental though. Being able to stop it and use it like a wall that no one can walk through without being near-sighted, deafened and slowed is quite strong and definitely will be one of the things to be rolled back upon a future balance.
Definitely going to get the Neon treatment, but I don't think his peak OPness will be the same as Neon and the nerfs won't be too drastic. Neon was genuinely a problem along with Iso and the nerfs definitely put them in a fair position now.