Well I don't agree with this. You can easily fake Page rank too between the PR updates.. All you have to do is buy a PR domain and change the nameserver and voila! you have a domain with real page rank(according to the tools) which shows even after you use info command
Its definitely not a good thing to go for domain just by checking PA/DA but the combination of PA/DA,PR, TF, Backlink, Anchor text ratio,Archive results. Its not difficult to find out whether the domain has been spammed or not.
And BTW you should also consider checking TF as well because its the most difficult metric to fake(Some spammed domains do have a high TF but they are mostly hacked domains or with sidebar links) so look out for domains with a TF more than 15 and those usual factors like good PR, DA and links and you should be able to grab a great domain.