This sentence doesn't do much good, and it dismisses the fact that language CAN, in fact, provide a totally accurate (though abstract) model of reality. You might as well be saying that the interpretation of data in science is as subjective as the words used to describe them. Everybody is looking for the same thing - truth. And, some call that truth different things, which is OK. What matters is if someone's definition of truth is tautologically correct and thus a mirror of absolute truth itself. Reality, like logic, is self-contained, for if there were something real enough (or logical enough) outside of reality (or logic) to be described as such, then it would still be included within reality (or logic). Truthful models can exist, and there can be multiple truthful models if all of the variables are analogous to those contained in another model.
But, the most important thing to note is that the mere existence of absolute truth is actually ridiculously easy to establish, because any attempts to deny its existence only reinforces its existence. The same can be said for a totally accurate model of absolute truth - any attempts to disprove it will only reinforce it.
Suppose you say, "All truth is relative." Then you are actually saying, "It is the absolute truth that all truth is relative." If you say, "There is no absolute truth," then you are really saying, "It is the absolute truth that there is no absolute truth." If you say, "There is more than one absolute truth," you are saying, "It is the one absolute truth that there are more than one absolute truths."
A perfect model of reality functions the same way. Religions are attempts to construct such models.