The track difficulty should be adjusted to a red dashed line from Laguna 69 to refugio Perú.
The track is technically way more demanding than the descending route from refugio Peru to cebollapampa, which is shown in a dashed line.

The Track between Laguna 69 and the refugio includes passages on a very steep slope and also parts of very big rocks. The only indicator of the way in these parts are the little stone towers built by others.

A sign indicates 2h walking time, which was accurate for me as a relatively fast hiker.