All mine that are phosphorus free, say it on the label. I don't have any of that brand though. I have Sticky Tongue Farms and Repcal. I would assume if it was phosphorous free it would say so.
After a quick look at exo terra's website, they claim it has "Low phosphorus". I would imagine it would be ok to use until your able to track down some with out any phosphorus. Definitely get some with out though, i know i got mine from tikitiki reptile.