you are correct that the dobb's ruling does not restrict federal abortion regulation, but it is an open question of whether this court would overturn federal abortion legislation as not being related strongly enough to interstate commerce.
Of course that ruling should cut both ways and eliminate the possibility of a federal ban as well, but as we've seen the majority is willing to overturn precedent both as old as 50 years and as young as 2 years (see Gorsuch dissent on Oklahoma v. Castro-Huerta) so its possible they would find the rational to uphold a ban even if they strike down a law mandating access.
Of course that ruling should cut both ways and eliminate the possibility of a federal ban as well, but as we've seen the majority is willing to overturn precedent both as old as 50 years and as young as 2 years (see Gorsuch dissent on Oklahoma v. Castro-Huerta) so its possible they would find the rational to uphold a ban even if they strike down a law mandating access.