We have several Amish communities here in Michigan and from what I've seen, it's not they outright refuse technology it's that they will use it only when there is a very practile reason to.
Cases in point:
Their buggies have battery powered led lights in front and back. Some even have a solar panel of the roof of the buggy to recharge the battery.
Those that do have a car or truck are expected to share them with the community when needed unless they are strictly for a business use.
It is not uncommon to see them using tractors on farms that are over several acres in size, again it is expected that they be shared with the community.
Their stores use cash registers and accept credit cards as well as cash or barter.
The many Amish furniture makers here do use power tools, in Amish homes, not often seen.
Many do have small solar power setups to help power lights, refrigerators, clothes washers and dryers.
They do have utility supplied power and natural/propane gas for stoves & ovens (though wood pellet fired heating furnaces are preferred vs gas).
Most do NOT use telephones much less Internet outside of businesses and do not have tv/radios as they are viewed as distractions from Community Life.
I believe it's also connected to prepping. Typical preppers will want to avoid complicated technology and rather rely on something they can easily build themselves just incase there is a collapse in "civilization", or that advanced technologies are out of reach for most people. Remember having a feeling years ago that advanced tech are (or will become) traps,...people will be so dependent on them that the system will place lots of evil restrictions with evil conditions that have to be met before access can be granted. They probably had thesame revelation and became cautious.
If the alternative system was very organized, members would be building their own advanced technologies that are free, safe and without potential evil condition of use, so long as users aren't doing anything bad with/through them.
In regards to avoiding TV and radio, aside distractions, the main reason for that part is likely to avoid getting brainwashed by the negative system.
They could just build alternatives that are only connected to their frequencies instead of completely avoiding the technologies