To a local observer yes, but to someone moving at a different speed no! FloatHeadPhysics does a good job explaining some of this https://youtu.be/OpOER8Eec2A
GPS wouldn't work without accounting for relativity, for example.
Unlike "sometimes a second is longer than a second" (not literally true but it makes some sense in the context of relativity), this one just seems like a tautology to me.
In other words, the only thing we can say without qualification is that a second is just a second in the same frame of reference. All other statements must be heavily qualified.
Even things like "A's second is longer than B's" are only valid in some frames of reference and not others.