It's absolutely fantastic. One of the big insights is that people want to be inside the regulatory system if it can be made easy enough - because having a legal business on legal land gives you protection. Whereas the de facto unregulated anarchy was also reliant only on community protection. Also making the commonsense but controversial argument that the solution to huge numbers of people who have lived on squatted land for years, built houses etc is to ... give them title to the land.
(You should probably read something else about Peru in the same time period as a counterbalance, especially given that this took place in the time of Fujimori, but the ILD work on title and registration is extremely solid and should be above left-right factionalism and is not in conflict with human rights)