OK this is what I see from that article, there are many more quotes that I dont feel like posting:
If you would like to plant your shrimp tank, you can do so with various undemanding species of plants. The plants, if not planted in excess, will help in keeping water parameters at healthy levels (along with the biofilm). Just keep in mind that you have a shrimp tank and not a planted tank and keep your priorities straight. It will be much harder for you to keep shrimp alive and breeding in the long run if you run a heavily fertilized, high-tech tank. A heavy fertilizer regime is just not compatible with the water parameter needs of shrimp over a long period of time.
He never once says, "do not keep shrimp in a planted tank". He does says many times that they will not do as good in a "high-tech" tank, or a community tank. Basically what it says or means is this: If you want to have the best home for your shrimp, then its obviously a shrimp only tank, normally planted but lower tech w/o CO2 and no ferts. This will result is the most shrimp possible. Shrimp love plants, mainly mosses, which are mostly found in lower tech tanks. Mosses are deff great for shrimp as they love it.
What I get from it is this, there has been some info on the internet that says shrimp may have issues with higher levels of ferts and CO2 or even Excel. Like this:
Dosing Ferts w/ RCS
Point is, RCS are very hardy shrimp. They will readily breed in "heavily fertilized, high-tech tank" and thrive contrary to what these articles say.
Other less hardy shrimp, like CRS are more sensitive to water parameters.
Anytime you put shrimp in a community tank, you will be putting them at risk of being eaten.
Myself and many others have RCS in "higher-tech" tanks and they breed just fine. Also we have them in community tanks where its a fact that many smaller shrimp do get eaten, but they still reproduce fast enough that you can sell extra's if you wish. Also that article says that "cories" are safe, but they have been known to hunt and eat babies.
So my opinion is have a nice planted tank so the shrimp can hide and feed. RCS will be fine in a high tech community aquarium, but other shrimp are best kept by themselves in a lower tech tank.