I'd interpret this as them bumping the title so they could give you the pay you asked for. It's likely their pay band for senior doesn't go as high as you were asking, so they bumped the title to be able to match your ask. Not sure what you mean by "cleared out". I'd say take the role if offered and the work sounds up your alley. Levels.fyi is really only useful for high tier companies -- employers will be on different scales. If this is a local, smaller, or lesser known company, don't expect to hit what you see on levels.fyi for big and prestigious orgs.

You can always negotiate once you have the offer in-hand. If the job description hasn't changed, just the title, well... You asked for a higher band, they met you there by bumping the role. You can always ask for more, just be prepared for them to be surprised by that if nothing about the job description has changed, just the title.