I've also heard this opinion. No needle is made of pure titanium. That would cost hundreds of dollars.
Any needle referred to as titanium is, in fact, only titanium coated with titanium nitride which is an ultra thin coating applied to the surface of the needle. The coating is very hard and reduces wear on the needle. It does not significantly affect the overall strength of the needle.
Most industrial sewing factories around the world use titanium-coated needles because they last 5-8 times longer than the standard chrome-coated needles.
I recomand topstitch needle for all sewing.