I don't know.
But if you read through their site, and look at some other background information, it becomes clear that their store front and their distribution businesses are separate parts - they aren't running distribution out of the back of the store.
Perhaps they distribute mini-lab chemicals without an intention of putting them on the storefront site.
I buy quite a bit of stuff from freestyle distribution and they may not literally run their distribution out of the back of the store, but the two inventory systems appear to be one and the same. If you have a wholesale account with them, you can request that they update your online (storefront) account to reflect that and then just buy stuff at wholesale prices directly off their main website. For stuff that they don’t directly distribute, you get the normal online retail price, and for stuff that they are a distributor for, you get the wholesale pricing. Almost all of the online orders ship from their warehouse unless you buy something that is only located in their retail store, then it’s shipped from there.
If they sell it, it’s on their website. I'm not aware of a separate list of inventory that only wholesalers or mini labs would use, as I buy my c-41 chemistry from them and they know I run a lab, and I buy enough other stuff from them that if I stopped, there’s a pretty high likelihood that they'd reach out and ask what’s up as they’d suddenly be missing a non-insignificant amount of cash coming in. I doubt that I’m a large account by large account standards, but I generally have at least one order a week in with them, and I usually order enough at a time to get free shipping.