Here is the entire printed section from the 2014 brochure. No mention of barbs. If ever they were not legal, I don't recall it going back to 1963.
The are a cool looking broadhead and apparently well made. Looks like the 175 is a screw on only.
4. HAND-HELD BOWS A long bow, recurve bow or compound
bow on which the string is not drawn mechanically or held mechanically
under tension. String or mechanical releases are legal if they are handdrawn
or hand-held with no other attachments or connections to bow
(except bowstring).
a. Hand-held bows, including compound bows, must use arrows with a
broadhead having a minimum 7/8-inch outside diameter or width and
minimum of two steel cutting edges. Each cutting edge must be in same
plane for entire length of cutting surface.
b. Only legal, hand-held bows allowed during archery seasons.
c. Minimum draw weight of 35 pounds required. Let-off maximum of 80
percent.
d. No part of bow’s riser (handle) or track, trough, channel, arrow rest or
other device (excluding cables and bowstring) that attaches to riser can
contact, support and/or guide the arrow from a point rearward of the
bow’s brace height behind the undrawn string.
e. Bows can propel only a single arrow at a time. No mechanisms for automatically
loading arrows allowed.
f. Scopes, electronic or battery-powered devices cannot be incorporated into
or attached to bow or arrow. No lighted nocks.
g. Hydraulic or pneumatic technology cannot be used to derive or store
energy to propel arrows. Explosive arrows prohibited.