If I am willing to relocate, is it true that Pure Functional Analyst very hard to land a tenure-track faculty position?
Tenure-track positions are hard to get in any area of mathematics. I don't think that functional analysis is any different in this regard. The question you should ask yourself (and your adviser) therefore is more whether (i) you are good enough to compete for them, and whether (ii) you are doing what is necessary to make sure you get a chance to compete. The latter, for example, involves writing papers, going to conferences, talking to colleagues, etc.