if someone is in a lucid dream, and they think/visualize the tetragrammaton (in hebrew,) is the information or experience that then follows in said experience, definitely True, or not necessarily at all?

shalom uvracha, It is not necessarily true . I personally recommend to drop the lucid dreaming. The torah says: תמים תהיה עם ה' אלקיך , meaning that we should do simply what the torah tells us to do without trying to find out what will be in the future etc. all the best!