Hi spyle,
In most cases no. There is a testing standard called CertiPur which is less stringent than Oeko-Tex and is a voluntary standard put together by foam manufacturers which is used to certify much of the memory foam or polyfoam in North America which for many people would be “safe enough” for them but there are still some people may still be sensitive to memory foam or to a lesser degree polyfoam even if it has passed CertiPur. This type of sensitivity would be very rare with any type of latex and Oeko-Tex is an independent testing agency not “industry sponsored”.
The topper you linked is made by Sleep Innovations which is CertiPur certified* but is only 3 lb density which is a low quality and much less durable material (you can see the criteria I would suggest for memory foam in post #10 here).
ADMIN NOTE: *Removed 404 link|Archived Footprint: certipur.us/pages/for-consumers/find-products/
Phoenix