An employer has placed an ad, hired a recruiter or whatever means to find candidates. You have already been told what the company will offer you, of course fine details are left for negotiation, which you can also ask about in an interview.
I think Toni's point was that they are not focused on selling the job at that point, as much as they are focused on finding out if you fit their needs.
As an applicant, it is your job to also have done your homework and have those relevant questions to ask for yourself. If they won't answer you or are evasive in what they offer, then there's a red flag indeed.
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