The problem is about detergents, non detergents and solvents.
The pH comes more into play as far as i am aware when using detergent based products as opposed to microsplitters etc. Start throwing in enough solvent that means you can't sell it in tubs bigger than 5 litres (which is the situation with one of those liquids) and then you have mixes that without proper testing, could catch you out. Without having a team of scientists that have the knowledge for products on soft furnishings, you end up having the end users as being your testers. And you can see from that FB post, any problems and you will want to refer to the supplier, if that suppliers response is to block you to save face, then thats not a great option.
A lot of solvents aren't free rinsing with just water, so if using a solvent prespray, if you haven't got the right type of solvent in that prespray and the right rinse going on, you end up leaving a lot of solvent behind, that causes problems with the fabric after drying.
A lot of this can be solved if you are using a TM with high heated rinse, which i think these products are aimed at, but i'd be really cautious using them in domestics with portables.