I started using TTL 50 years ago. Then came the 74HCT and 74HC families. They all used 5 volt level signaling. CMOS levels, in the past, was up to 15 volt. In that perspective talking about CMOS signals nowdays would really be misleading.
Skip the chemistry and focus on the voltage being used. You know pretty well how often newbies connect RS232 to Arduinos. What do name that signal level?
No, using the old name TTL for 5 volt signals is correct for me.