What are your thoughts on using howtostudykorean.com to study Korean?

What do you think about using howtostudykorean.com as a Korean learning tool? I have been studying Korean intermittently for the past four years, but I still only know Hangul and a few basic sentences. Recently, I have been trying a method called 'fluent 75' that I discovered on Instagram, which consists of at least 10 minutes of speaking, 5 minutes of reading, listening to Korean videos or podcasts, and studying for 1 hour. However, due to my ADHD, it's been difficult to maintain consistency, and I only practiced on the first day. On that first day, I used howtostudykorean.com, and I wonder why this site is not mentioned much when it comes to discussing Korean studies. The first lesson was easy to understand, even though it was online. Have you ever used this website? I would love to hear your experiences or advice.