Djokovic went 0-4 vs. Fedal (3 losses to Federer and 1 loss to Nadal) after the USO.
Djokovic losing to Federer during the late 2010 indoor season is quite unsurprising, given the high level of Federer on indoor. Federer is, along with Sampras, the most dominant player ever on indoor hard. Even 38 years old Federer beat Djokovic on indoor hard in 2019. Djokovic losing against Nadal at the ATP finals is a bit of an anomaly, but only one match, so nothing weird considering it was Nadal at his absolute best. Peak Nadal has also lsot matches on clay to Djokovic.
2011-2012 peak Nadal lost 3 consecutive Slam matches to Djokovic (and many more in Masters 1000). 2008-2009 peak Federer lost 3 consecutive Slam matches to Nadal. 2012-2014 peak Djokovic lost 4 consecutive Slam matches to Nadal. Losing is not a synonym with being non-peak. No one is unbeatable.
Djokovic commenced his peak at the Slam level at the USO 2010. Only because he lost the final to Nadal, it doesn't follow he was non-peak.
1. Shanghai was outdoors
2. Djoko also lost to Nadal at the YEC
3. nadal's level on clay is higher than fed's indoor in general. yet Djoko straight-setted him on clay in Madrid 11 and Rome 11.
4. Dubai is also one of fed's pet tournaments. djoko straight-setted him in Dubai 11.
5. 11 Wim/USO was prime, but not peak Nadal
6. Wim 08/AO 09 was prime, but not peak fed
Djokovic won 1 small title from USO 10 till year end
those instaces you refer - matches were competitive
Djoko won 1 set combined in 4 matches vs fedal after the USO
from 0-4 to 10-1 is a BIG change
Federer played 2 ****ty sets in USO 2010 semi (2nd and 4th). can be proven easily through stats. that's why Djoko was able to win that match. He was no better than USO 07-09. In USO 10 he just returned from the funk he was in previous part of 10 to a good level (good level that he had in major chunks in 07,08 and even 09). that's it. It wasn't anywhere near 11 level. If USO 2010 is peak djoko, then so is 07-09 USO djoko.
you have offered zero proof that USO 2010 djoko was peak Djoko.
OTOH djoko himself has mentioned DC 2010 as a turning point. That plus training in offseason helped him.
the results/stats (&eye test) show post USO 2010 to end of 2010 was not peak Djokovic.
2011 start onwards the results and stats make it abundantly clear was peak Djokovic.
post USO 2010 till season end: 17-5 (77.2%) win loss record, 59.5% games won
2011 entire season: 70-6 (92.1%) win loss recors, 62.9% games won
djoko had 5 loss in 22 matches in the first period compared to 6 losses in frigging 76 matches in 2011!
if that doesn't open your eyes, what will?