That's indeed the opinion of the author.
Note however that at this time all elements used in the setup described on dockerswarm.rocks are maintained. I started using swarm in 2022 and I documented my decision [1], and my reasoning for my kind of needs as not changed. The investment is very low, as well as the risk. Migrating away from swarm should not be very problematic for me, and in the meantime I enjoy an easy to maintain setup. I still think it's better than tweaking a maybe working solution with compose.
I'm not expecting to convince anyone but wanted to share an alternative approach(only applicable to certain setup)
https://dockerswarm.rocks/swarm-or-kubernetes/ says "it's not sensible to build a new product using Docker Swarm Mode"