What's the difference between "Richtext" and "HTML text"?

Question

I'm on Evolus Pencil Project 3.1.0 on Linux 64x.

Both elements seem to be exactly the same?

I thought that "HTML text" could allow you to type directly with HTML tag, contrary to Richtext, but if it's not the case.

(For example, if I type in the HTML text box: look to this <a href="mylink.com">link</a>, it doesn't appear as a link)