Kobe actually did have some good performances in elimination games during the 3peat, but after that, Kobe was a legitimately terrible elimination game performer
2003 vs. Spurs: 20/2/6 on 9/19 with 7 TO's in a 28 point loss
2004 vs. Pistons: 23/2/4 on 7/21 in a 13 point loss
2006 vs. Suns: 24/4/1 on 8/16 wit 4 TO's in a 31 point loss
2007 vs. Suns: 34/4/1 on 13/33 with 6 TO's in a 9 point loss
2008 vs. Celtics: 22/3/1 on 7/22 with 4 TO's in a 39 point loss
2009 vs. Rockets: 14/7/5 on 4/12
2010 vs. Celtics: 23/15/2 on 6/24 with 4 TO's
2011 vs. Mavs: 17/3/1 on 7/18 with 5 TO's in a 36 point loss
He finally did play well in 2012, dropping 42 on the Thunder albeit in another blowout loss