In Order of the Phoenix, Mrs. Figg implies Dumbledore opposed the Reasonable Restriction of Underage Sorcery act.

Talk aboutthe Reasonable Restriction of Underage Sorcery... this was exactly what Dumbledore was afraid of...

But the Law was passed in 1874, before Dumbledore's birth: (Chamber of Secrets)

As you know, underage wizards are not permitted to perform spells outside school, and further spellwork on your part may lead to expulsion from said school (Decree for the Reasonable Restriction of Underage Sorcery, 1875, Paragraph C).

So what did Mrs Figg mean by 'this is exactly what Dumbledore was afraid of', which sounds like he opposed the law?