Is life force energy from Creator supplied to incarnated humans via the interdimensional DNA? If not, how is that done?

Your intuition is correct on this important point, that the life force energy that allows you to take each breath and for the workings of the body to continue in a vibrant, robust, way until the very end of life, are owing to the continual delivery of life force energy coming from Creator's intention for that to happen, and is delivered via interdimensional DNA from your soul to your physical being. This, indeed, is your tether as it supplies the energy in all respects that comprises your consciousness as well as the physical body and the energetic layers helping with regulation and maintenance. The fact that thoughts persist indefinitely, does not mean your consciousness as you express it intentionally, will persist. In fact, with a true and total death your thoughts would cease and therefore creation of new thoughts, so the workings of consciousness need energetic support. It is the raw material you have to work with to continue your life experience, with its growth and learning and hopefully expansion as the primary goal. So this connection to the soul is indeed the lifeline and of utmost importance to your continued existence as you experience it in the physical plane.