Yes it's true, unlike you might of thought, The Rebbe Of Chabad Rabbi Menachem Mendel Schneerson, Prophet and Jewish Leader of this Generation said Publically that he is the King Messiah! link here!
This adds to the Rebbe King Moshiach Shlit”a encouraging his follower’s singing “long live the king messiah” to him link here:
and after the Rebbe King Moshiach Shlit”a had a Stroke the Rebbe Continued for the next year and a half (a total of over 400 times) to encourage the crowd which sang “long live the king messiah” (in hebrew “yechi adoneinu...” ) link here: