Correct. It was supposed to be faster. Consistent readings of the speed show a slight but continuing decrease.
As measurements are refined, over a few more years, we will have an absolute answer about whether it is occurring, but there is still afaik atheoretical basis for it.
This site has a good summation.
http://www.ldolphin.org/constc.shtml
It may be a consequence of the new theory (discovered by me in 94, and by Sima and Sukenik of Slovakia in '89) of the Expansive Non-decelerative Universe.
If you can't tell by now, I think CDK is a crackpot theory. It supposes light to have been a lot faster (about 11 million times the present value) not long (6000 years) ago. It does this and engages in several other contortions to attain a predetermined religious end, a literal-Genesis Archbishop Ussher timescale for the universe. Wrong-headed and hopelessly unworkable from the get-go, it lives on in the limbo of theories that cannot die because it is not permitted for them to do so. (God wouldn't like it.)