@James *******
Yeah, this is just a general infographic from the Thai Consulate in Munich trying to explain the difference between Visa/E–Visa Validity time period vs. permitted stay (Period of Stay) stamped by the Thai Immigration Officer at Entry....
Unfortunately, this general infographic from the Thai Consulate in Munich doesn't better explain Multiple Entry E–Visa's such as DTV, METV, Non O–X, Non O–A, LTR, etc. among other Thai Visa's/E–Visa's