He went on a trip with friends for atleast a week. Devblog can be found if you go back like 2 pages. Not sure why you're so surprised by the DLC's as it was literally announced in the game at the end of Chapter 05 and mentioned like 100 times in this thread.
The first DLC took too long, can't argue here. 100 images in like 2 months was pretty slow, yes. 2nd DLC taking just over a month including vacation is totally fine unless it's 20 images - which by the way you should be looking at the amount of images not just "How long did Chapter X take compared to this". More images, more work. DLC or not.
2025 has not been the best yet, I'm not gonna sugarcoat it. But maybe wait for Chapter 06 and see how things go after the DLC's before going up the walls. And keep in mind CG never made any promises or set up Patreon goals like a bunch of other devs who could actually be called out for "milking". CG is just doing his thing - no strings attached. You're not being promised the holy land after supporting him financially, not lured in to pay for monthly updates or anything. Totally up to you if you wanna support him or not.