I read that same document prior to my purchase of the HP26500... it is, to say the least, a bit biased in their claims.
they even go as far to add this in their fine-print:
they could have documented that their printed Snozzberries really DO taste like Snozzberries, and all would be fine and dandy.
long story short, to easier answer your question... Latex prints are certainly NOT only good for short-term outdoor graphics. I have exterior murals up for nearly two years now with no fade whatsoever. Most likely because I laminate everything worth selling to my clients, with laminates containing UVinhibitive properties.
I'm not going to bash solvent printers either, as I ran my mimaki jv3 for nearly 10 years without issue and exterior, laminated, prints that still hold brilliant color. ....though I WILL bash ecosolvents, due to their lack of versatility in media able to be printed on. But i'm sure you know that already
without breaking-down every argument posted in that document, I must also include that I do NOT spend $600+/month changing printheads on my latex. Sure I enjoyed using the same ~$1k printheads for almost 4 years in my solvent printer before all four of them started dropping like flies (which would have been $2k to replace for each, had I not learned how to do it myself instead of calling a tech everytime my printer was down) BUT I sure do love being able to swap out my $100 printhead on this latex when need-be...approx. every 4-6months, depending on usage or the occasional gnarly head-strikes that any printer operator has nightmares about when in a rush.
Bringing the HUGE argument for these printers, aside from instantly-dry ink----> downtime for the printer when a head fails: 5 minutes for HPlatex vs. 1hr'ish and a heck of a messy solvent-soaked monday, assuming you already know how to do it well yourself....or up to a week(or so), depending on how reliable/available your service tech is.