Promo copies often have markings on them to denote their non-marketable status, like the text you shared, but also sometimes there may be a corner of the jacket cut off, or a small slot cut into a corner, or other physical alteration. This may in some cases affect the resale value of the album. Of course, that could be in either a positive or negative way, though for the marks that deface the album or jacket, more likely negative.