it's more important to look at the sensor (traits) and the mouse/firmware, rather than the cpi.
there are sensors with low cpi that are rather accurate, while there are also sensors with high cpi that are not so accurate.
some mice have a decent or even good sensor, but bad firmware that impacts performance negatively.
but more factors come into play, like mousing surface, subjectivity(!), what you plan on doing with the mouse, etc.
some high cpi mice are arguably terrible, while other mice with high cpi are fantastic. the same can be said for mice with lower cpi.
i think most here would say that things like shape and texture are more important than whether or not the sensor is super-duper-amazing (as long as the sensor isn't outright atrocious). but of course, everyone has different standards when it comes to what is atrocious..
if you plan on buying a mouse for anything that benefits from more precision, i suggest you do (at least a little bit of) your homework.
TLDR, if you really wanna know the answer then i'd say you have some reading to do, but imo the simple answer is yes; high cpi tends to hint towards a capable sensor that's more accurate than sensors with low cpi.