100% True. Fragmentation does not hurt Flash drives.
While they don't have to deal with rotational delay or seek time, some file systems will have a CPU overhead when dealing with fragmented files.
If the flash memory is connected to a decent controller then only issuing one read request is likely to be faster than issuing many.
Modern RAM is solid state, but can read from contiguous locations faster than random access. So it's possible that some flash memory could have similar properties.