I think the claim is true, I also think that a lot of missiles would get through.
A baseball analogy, an excellent, best in the world baseball batter will hit 4 out of every ten balls thrown at him. that is still an awful lot of balls that get through.
For real world numbers note how well Israel does against all the ballistic missiles thrown at them, also note that these are slow short range ballistic missiles.
The motors on these burn out pretty quickly, after which point they become atmospheric ballistic (not truly ballistic because they have fins and there's atmosphere). This is true of all basic rocket artillery generally.
A baseball analogy, an excellent, best in the world baseball batter will hit 4 out of every ten balls thrown at him. that is still an awful lot of balls that get through.
For real world numbers note how well Israel does against all the ballistic missiles thrown at them, also note that these are slow short range ballistic missiles.