I don’t think Stanford interprets an RD applicant as less interested than an REA applicant.
I understand Stanford claims there is no admissions advantage to applying REA and Stanford KNOWS it is a reach school for everyone. That means there are many students for whom Stanford is a first choice who nevertheless do not want to limit themselves with respect to schools that are more likely to admit them by filing REA with Stanford.
I don’t think it will make a difference.