I don’t know who or what organization the publishers are associated with, but looking through their intro and appendix I would call them a Sacred Name movement. The also seem to be Sabbath keepers (Saturday, not Sunday). Also in the inerrancy of Scripture.
The intro states that for the NT they started with the Textus Receptus and made their adjustments based on their beliefs. In particular they believe that the original was inspired in a Semitic Language, not in Greek which to them is profane. This assumption gives them the basis to make numerous textual changes, including the restoration of YHWH in the NT.
Institute for Scripture Research has a website, though I don’t find it very informative.