WHAT SAY YOU??? The HVAC condensate draining line draining into the bathroom sink drainage …??
It has been debated here… https://www.nachi.org/forum/f20/need-code-reference-ac-condensate-drain-line-61850/
Only if the plumbing inspector agrees. Here in Florida most require an air gap.
Into sink drains is the most common method used in the Dallas-Fort Worth area. The uphill flow in your pic looks problematic to me, though.