It’s not an accusation. It’s now standard industry practice, as can be seen from some of the links in the previous post. The power has to be dialed down if the device is to be sold in the EU.
Complying with the EU standard would mean that the devices have a shorter broadcast range than US laws would allow. That would put a “universal” model at a significant competitive disadvantage for the US market, as most consumers look for the longest range possible for most home automation devices . Hence the reason why most of these manufacturers make two versions if they want to sell in both markets.
There are many different standards that apply to devices sold in the two regions. Having a CE certification for the UK is not the same as having a UL listing or an FCC certification for the US. So it is not at all uncommon for electronics devices, networked or not, to be made in different models for the two markets.
At present, Samsung does not manufacture the sensors and pocket sockets sold under the SmartThings brand. They’re manufactured by other companies and then relabeled by SmartThings, as was done before the Samsung acquisition.
In the US, they are manufactured by Centralite. I haven’t looked into the exact sourcing for the UK versions, but there should be a compliance label on the back or inside the battery compartment which lists the licenses, and from there you can look up the manufacturer.