That web page specifically lists the 3.30 GPA requirement in CS 61A, 61B, 70 to declare the L&S CS major.
Any L&S major where the requirement to declare includes a GPA > 2.0 or grades higher than C is capped (enrollment), where the higher GPA or grade minimum is used to limit enrollment to stay within the department’s capacity. Note that the L&S CS GPA minimum of 3.30 is higher than that of some other capped majors like economics (3.0), psychology (3.2), statistics (3.2 in math prerequisites, B- or higher in STAT 134 or 135), ORMS (3.2).