The article is quite kind to Schliemann. Kinder than many archaeological experts. The excavated area thought to be "Troy" had about nine distinct layers. The "Troy" that everyone is interested was one of the upper layers (like Layer VIII, the second from the top), which Schliemann kept digging through. The one he finally settled on and brought "Priam's Treasure" from was much older, long before the era of the fabled…
The best video documentary I've seen on this is Michael Wood's BBC series "In Search of the Trojan War" from 1985. Six parts covering the history of the dig and the background of the war and aftermath. Much of it is on YouTube I think.