Level acceleration segments used to be required by Pans Ops in the construction of all SID and Missed Approach procedures. It had a fixed length of (from fading memory) 6NM, followed by a 1% climb segment right up to enroute safety, MSA or whatever the country deems appropriate.
It was based purely on ensuring terrain clearance. There was never any intention to require pilots to use it that way. It was merely a consideration for aircraft that couldn't sustain the required climb performance above a particular altitude.
Pans Ops no longer requires the use of a level acceleration segment. It was removed from the document quite some years ago. Sooo, either the SID in question has been in existence for many, MANY years, or has been designed to the old criteria because the procedure designer didn't have an up-to-date Pans Ops volume 2 book.
If the latter case is correct, it won't be a worry for pilots as deletion of the level acceleration segment was the only change.
Hmmm, just thought of another reason for use of this segment in a new procedure. Some authorities might actually prefer to retain it in their procedures. Certainly, if terrain isn't very restrictive, this isn't much of a problem. But, as a procedure designer myself, I can tell you that it used to be right b@stard to design it into any procedure!
Anyway, chaps, the bottom line is that if you don't need to use level acceleration, don't worry about it ... just keep on climbing.
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Once a king, always a king.
But once a nite's barely adequate!