You can be sure of whatever you want to. But these titles have quite obvious meanings. And they are readable enough to correctly guess most features of enemy Pretenders. At least for me they are.
And considering "your own title" - of course, it can be flashy enough to warm your heart.
But it is easily parted from the titles your Pretender gets for his paths and scales. The way to do it is to look up the name in "Pretenders of the world". Here all titles you give yourself are included in the name itself. So looking in the nation stats, your crafty opponent just drops those he already seen above from those meaning of which he's interested in. Much more obvious than your "of course", Zeldor.
Considering Gandalf's question - I think no. There are titles that mean Astral magic. And if there are enough of them, I guess it's high Astral. The best way to conceal your abilities which exists there is to take low Dominion as this means less titles. However, this has drawbacks of its own. Another possibility that exists is that if the Pretender has high enough Dominion, he may get more titles relating to his path(s) than his score in it would suggest - if his scales are mostly neutral and he has few paths... Nevertheless, it's useful thing. I can't currently find out chassy for sure, but it may be guessed from paths. And I think that more experience (or definitive study) will allow to do it at least sometimes.