As people pointed, these ads are somewhat personal, but...
But there is a general pattern of people on typology forums to be neurotic in general - and that means more anxious, more angry, more feelings of helplessness and, specially, more depressed. This is one of the best explanations about why you see people getting banned lots of times in several different forums - what appears first as rigid MODs, is actually a general pattern of forums on MBTI.
Im kind of surprised that google catchs it, and that probably means that these ADs probably even psychoanalyze our words - they probably have bots that could even type us based on writing patterns that a program can catch with some accuracy - although this could be coming from a word counter finding out the word 'depression' to be on top.
But some few researches also had detected IXFXs tendency to being a little bit more depressed than other types by default.
Also, there is no ESTP forum. In my book, there are only forums for INs plus ENTJ, INFP forum is definitely dead and ENTJ one is probably half-dead (I only accessed it, without an account, two years ago).