No that's not what's meant by "surrogate activity," not in the way OP quoting Ted Kaczynski meant to mean. They define anything other than the most basic, like hunting and gathering, as a surrogate activity. So anything that we call a career today where you can work, make progress, and maybe even enjoy is, in their opinion, a "surrogate activity." I suggest reading TK, it's a very cynical worldview, but there is some truth to some of the arguments, and definitely something worth taking seriously.