Samee!! I've been doing low-HR MAF training for the past 2 months and it's been a whole new experience. So many people get into running fast before they can run slow and get burnt out and injured!
Couldn't read the article due to paywall, but I noticed recently after converting to treadmill (for convenience) that I enjoy going longer and slower rather than short and fast. Ironically, the drab of running on a treadmill isn't as bad when I run slow enough that I can zone out and focus on the podcast/youtube/zwift-chat.
I started lightly jogging 50m then walking 50m. After huffing and puffing like a buffalo for a couple weeks. I started jogging more and walking less. Slowly made it to 10km. Running is fun regardless of how fast you go.