And for TA, sometimes it uses mean reverting to predict

price movement, same as those using complex statistic tools, sometimes TA catches the psycology of market participants, you can call it ridiculous, but you can't deny that, a lot of times, markets are not rational, people will get panic or too optimistic from time to time.
Marovian process is about possibility, TA and FA is also about possibility, although didn't say that directly, but when you study more, you will realize that