The odds that any artist is just sitting on five albums of material, with "no filler", fall between slim and none. First off, how many bands have put out five consecutive albums without a single bad track? Take whatever miniscule number that is, and divide it by the number of bands who didn't actually write any of that material between albums, but rather simply pulled it all out of an old catalog of songs they already completed. Then multiply that by the factor of Jari (a guy whose rantings suggest the mind of an individual completely removed from the realities of the music business) and you have your answer.
We can't fault the guy for saying there is no filler on his new unreleased stuff. We don't call bullshit on every other musician ever who does that.