Can not be considered to be a guarantee that your photos are safe as their are no standards for the term. This term also has no standardized definition, however, it implies that all materials used in the product are chemically stable. I have not found any companies that abuse this term. In all likelihood one of the biggest dangers to your photos is their environment, photos need to be in a stable environment. Temperature and humidity affect photographs and documents more than any other element.
High humidity is most harmful and high temperatures accelerate the deterioration.
This is a tricky question, because there is no right answer. The safer that your album is the longer your photos will last. However, there is no way to figure out how much faster your photos will age if you add a few un-safe items or if the album has one unsafe material used to manufacture it. My best advice is to seek out the safest supplies that you can afford. One thing to remember is that if you choose to use vinyl albums, they should be kept well ventilated so that the fumes from the vinyl do not have a chance to damage your photos.