I am going to give a longer answer than you probably wanted because there is a point of common confusion here. I don't know if you personally were confused about it, so I am writing for any reader who might have been.
Acclimatization is an important factor to consider prior to a dive before which you ascended from a lower altitude. In that case, using dive tables, you need to act as if the ascent from lower altitude was the same as a prior dive. Many altitude diving instructional courses treat that as the primary factor to consider because they do not talk at all about what I was talking about in my post--ascending to altitude after a dive, which is a very different thing. It is possible that your "already acclimatized" comment comes from a common misconception because of an oft published quote from a famous dive leader who sais, in essence, that he never worries about altitude in diving because by the time he is ready to dive, he is already acclimatized. That led to the erroneous belief among his followers that altitude did not need to be considered in dive planning.
Ascending to altitude, on the other hand, is essentially the same as ascending
during a dive. You are moving from greater pressure to lesser pressure, so you have to plan for decompression. That is why NASA and the Pentagon use decompression specialists in their planning--going from sea level to high altitude flight or into space creates a dramatically fast loss of pressure that can lead to DCS.
ScubaBoard has a forum called Ask Dr. Decompression, and for the first years of this forum, Dr, Decompression was Dr. Michael Powell, one of the scientists who did the research leading to the PADI dive tables. Powell's main job was as a decompression scientist at NASA.
Here is an article I wrote about
ascents to altitude.