I have some experience with this product.
Yes, it does have fertilizer.
A year or two ago I set a few hundred eggs (mostly bearded dragons) in this stuff before I noticed that it contained fertilizer.
By the time I noticed the product contained fertilizer (could have sworn I checked carefully at the store to see if it had fertilizer- imagine my shock and panic when I learned it contained fertilizer after all!), I had eggs in all stages of development from recently laid to nearly finished incubating.
I switched products and re-set the eggs as soon as I could find another brand- not easy in my area as apparently Miracle Grow has a monopoly on the market with all the chain stores here- walmart, lowes, home depot, etc only offered the miracle grow. So finally a day or two later I located some normal perlite in a mom and pop nursery about 40 minutes from here.
After resetting the eggs and finishing out incubation, I don't think it had much effect on the hatchlings- except for one- a very high male count- very few females in the few clutches that had stayed in the miracle grow product the longest. My first clutch contained 100% males (I know because I held them back to make picks for future breeding). That has never occurred in any clutch of bearded dragons that I have hatched since 1994.
At the time, I did find other people online who had incubated and hatched out baby lizards in the stuff as well, reporting no problems.
I also found a post somewhere where someone who looked like he knew what he was talking about claimed the stuff should be lethal because of the percentages of the particular chemical or chemicals used in the product.
I would recommend avoiding the product.