With much of the surrounding territory lost, Turkey has evacuated seven military posts inside northern Syria, more than half of the 12 posts they’d set up in 2018. That does not mean a reduced military presence, however.
Generally, Turkey has moved troops to the remaining posts, or to bases held by rebel allies elsewhere in the region. The Turkish troop levels are roughly flat across Idlib and Aleppo.
At the start of this, Idlib was rebel-dominated, with huge amount of rebel factions packed in as they lost various other territories around Syria. Turkey negotiated a ceasefire, and put troops there to try to defend the rebels.
But the Turkey-backed rebels got in fights with al-Qaeda, who weren’t part of the ceasefire, and after losing ground to them, the al-Qaeda turned around and lost it to the government. This left the government with a lot of the former rebel territory, and Turkey with posts that no longer made sense to try to keep.
amerikan turkeys and proxies gradually being eradicated from Syria
Erdogan is leaving because Putin made him leave. Russian troops are now embedded with the Syrian Fifth Corps. They are preparing to fight Israel and the US if it comes to that.