False claims 
In additon to the above, I found that these claims are false: the first one completely, the second one partially

"In 2004, Croatia added an amendment to the penal code which prohibits historical revisionism of genocides and crimes against humanity.http://www.nn.hr/clanci/sluzbeno/2004/2026.htm Another amendment was added in 2006 to prohibit any type of hate crime based on factors such as race, color, gender, sexual orientation, religion or national origin.http://www.nn.hr/clanci/sluzbeno/2006/1706.htm"

The first claim cannot be justified by anything in the reference aimed to support the claim. The penal code changes are not about 'prohibits historical revisionism of genocides and crimes against humanity' as claimed above. The second one looks like as stated, but completed by the rights of the Croatian Parliament to interpret the same law - allows the nacionalistic ruling parties to adjust these changes to their current political aims.