Hi amberwalla,
You can see some thoughts about flexible slat systems in post #2 here and the posts it links to. A flexible slat system would be an “active” part of a sleeping system so the only reliable way to know whether a flexible slat system would be an improvement for you in terms of PPP compared to a non flexing support system under the same mattress would be based on your own actual experience when you test it or sleep on it in person. For some people it could be neutral, for some people it would be an improvement, and for some it could be detrimental.
Your link was broken but I’m assuming that you mean this bedframe?
I can’t see the specifics of the design from the pictures but it appears to have 2 center supports which is good but if the distance between the slats are 6" then they would be too far apart for an all latex mattress and I would use something on top of them to improve the support surface area or make sure that there is no more than 3" (and preferably less) between any wooden slats in your support system. There are some suggestions for foundations that would be suitable in post #1 here and if you prefer something thinner then there are some suggestions in post #2 here that may be helpful (although with 6" gaps the polyfoam or bed rug may also be too flexible).
Phoenix