The technology itself is not evil, but humankind quickly put the technology to evil works.
Television technology can be good. It can inform, amaze, create an atmosphere of Christian culture and so on and spread the Gopsel message. It can be used by doctors to perform operations over long distances.
It is meant to be a good thing.
But, of course, it is also put to twisted uses.
Wood iron stone turns out evil for the wicked and good for the righteous.
Way back when I asked a Christian friend if a Caddillac was a good or evil. She simply replied “It depends on how it it used”. The same for television.
Now regards to that St. Mary thing. I don’t know if these visions of and sayings from “St. Mary” are anything but demonic. While I am inclined to agree that the demonic is able to enter homes via television - I think that happened with me - I can remember specifically, a certain sin entering and making its home in my young heart as I watched television way back in the sixites as a toddling child - I still do not trust this “Marianism”. I think it is demonic itself.
Personally, as is, I would live without television. Most of the channels are filled with sin and evil notions.