This is true. .
Those with Asperger's were diagnosed at a later age than those with Autism.
They did not expereince a significant delay in language acquisition, adaptive behavior or curiosity about their environment in childhood, nor did they experience significant conginitive delay. These differences lead to their being separated despite their similarities.
It is now agreed that Asperger's, as well as Pervasive Developmental Disorder NOS, and Childhood Integrative Disorder are a part of the Autism Spectrum.
With that said, Asperger's is still quite a commonly used title-at least in common parlance-to differentiate between HFA and LFA. Its use is not wrong, but outdated, and there are still very interesting books regarding Asperger's written prior to the publication of the DSM V.