Sunscreens with titanium dioxide do a better job of matching their labeled sun protection numbers and blocking harmful UVA rays than those with only zinc oxide, so they’re more reliable in real life.

The study talks generally about how titanium dioxide helps block UV rays and is safe, but it doesn’t actually compare how well titanium dioxide and zinc oxide sunscreens match their advertised protection levels in real life, so we can’t say if the claim is right or wrong.