I don't read anything about upper neck issues such as occiput to C-1. It appears most of the neck is about top of the shoulder level muscles and such.

Forcing a more erect posture with the shoulders and upper back can reduce the ability of the upper back to absorb vertical shock, from foot plants, etc. I suffered an upper neck injury and mild concussion when I had my back arched and had my shoulders and neck back and vertical because I was carrying and counterbalancing a plastic bag of garbage as I stepped of an 8 inch curb, thinking it was a sidewalk ramp. Having my spine in a vertical line meant I had no ability to absorb vertical forces.

Try walking with foam ear plugs in. You can hear the impact of each foot plant. Try different postures, shoulders forward and back, etc. and notice the difference.

This shoulders forward posture is important when riding over a bumpy road.

"Elastic tape manufacturers state that careful application works by microscopically lifting the skin from the muscle, improving circulation and range of motion and reducing pressure and irritation "

Microscopically lifting the skin from the muscle ????

I can see how some elastic taping can help with shoulders and such by providing support and a different tactile sensation cause a different pattern of use but some of the claims sound quite outlandish. Studies show some used are placebo and others have value.

Lymph taping sounds interesting as it can be a version of compression wear.

Here is an interesting article. The comments are interesting too.
Kinesio Tape: What Is It and What’s the Hype? | Breaking Muscle

I suggest caution about using KT to force a more erect posture for the reasons stated at the top of my post.