Yes, I agree that ladder in the photo is as you just cited.
After many ladder discussions, it seems that ladder has been there for a while, for access to the roof for maintenance purposes.
The 5 footer is from a source . . . Home Depot . . . Law Enforcement investigation . . .
Some speculation is that shooter used the 5 footer to climb upon an AC, and ‘bear climb’ onto the roof, from a location not photo’d or shown yet.
And the cop that climbed a ladder confronted the shooter and fell off - which ladder ??
That is how I have summarized the ladder(s) factor so far. But that can change, as/if more ‘facts’ come out.