The article is misleading. Look at the article closely - "Thomas' Instagram account is public, but her messages are password protected making obtaining them difficult for law enforcement."
The "jumbled" quote is from WAAY's tech expert, not LE, talking about encryption apps (apparently these apps will encrypt info on other apps, such as IG) - but we don't know if TC actually used encryption apps. All LE spoke of was password protection.
"At the local level, impossible for anyone to be able to get into these encrypted apps, said Jamey Tucker, WAAY 31's tech expert, "even if you get that information by the time you get it, it's all jumbled up and you can't make any sense of it."
http://m.waaytv.com/appnews/encrypt...cle_c0039142-129f-11e7-ab63-9fac39e6d413.html