The answer, Exodus, is that the atheist can believe that ‘objectively’ is just one way of understanding the universe - she need not believe that ‘objectively valueless’ is an ultimate statement about the essence of the universe. She may even believe that ‘the universe’ is ultimately valuable (something has to be, with God out of the picture!). Therefore your claim begs the question.
You fail to see the implications of actual subjectivity.
If the atheist delineates various ways of understanding the universe (that objectively is just one way of understanding it - as you say), then this delineation itself, if it does not correspond to some reality outside the individual - that is, if it does not exist in some way outside the individual - is completely subjective and therefore meaningless in regards to the universe.
You see, this is quite a common misunderstanding on the issue of objectivity vs. subjectivity, reason being is because no one is really prepared to understand the consequences of
entirely subjective beings. Too many subjectivists do not understand their philosophy, and nearly all of them retain some sort of objectivity.
If the basis of our perception of reality begins within us, if it all comes from us and there is no element of Absolute to which we somehow derive meaning from or take part in when we understand, there is absolutely no meaning outside the individual. This means the universe, as itself, is entirely meaningless. Of course, one may still
think or choose to believe the universe has meaning, but this claim says nothing about the universe itself, only about how the individual “feels” about it. (Of course, “universe” includes family, friends, loved ones, etc.)
The implication, if there is no absolute, is is that there is no meaning within the self either, other than the illusion one has due to your feelings which come from your genes/environment. For if all we are is matter, and matter has no instrinsic value, our thoughts and feelings are nothing more than valueless chemical reactions taking place in some grey organ about the side of a canteloup.
The brain, and therefore the person and his/her feelings, can only have instrinsic value if it is gotten from somewhere else - i.e. the absolute. If we come from the universe which is meaningless, we are meaningless. One can choose to believe otherwise, but this is simply an illusion