This is an example of systems theory couched in Risk. You don't gain any special insights into Risk from systems theory as framed in this article.
OP/TFA introduced systems theory, then introduced the usual winning risk strategy, and then introduced a lot of required steps like player management / table top diplomacy, selecting countries to attack, timing card cash-outs, boundary holding, and so on without systems theory.
You can dig deep into this stuff, I find it fascinating to see what others may not see through an understanding of how to visualize the problem as a system within a system.
OP/TFA introduced systems theory, then introduced the usual winning risk strategy, and then introduced a lot of required steps like player management / table top diplomacy, selecting countries to attack, timing card cash-outs, boundary holding, and so on without systems theory.