[Al Skierkiewicz]

Please see figure 2 in the Rev J version of the Robot Rules Section 8. I cannot see the corner very well in the picture you linked but if it looks like the right side of figure 2 then the answer is "no".
J. Corners and joints between BUMPER segments may be filled with short pieces of vertically
oriented pool noodle, by wrapping the pool noodles around the corners, or by beveling the
ends between adjacent segments so they form a tight and complete protective surface (see
Figure 8 – 2).
and
N. BUMPERS may extend beyond the BUMPER PERIMETER by up to a maximum of 3-1/2
inches per side. “Hard” parts of the BUMPER (i.e. plywood backing, fastening system, and
clamping angles) may extend up to a maximum of one inch beyond the BUMPER
PERIMETER. Only “soft” parts of the BUMPERS (i.e. pool noodles and cloth covering) may
extend more than one inch beyond the BUMPER PERIMETER.