I am currently solving this Problem and I am not able to understand its editorial. Can someone explain it to me in simpler words ? Or if you could share some resources with me which will help me to understand this editorial, that too will be very much helpful.

Without preparing for any kind of Olympiad in his/her life.

People with higher rating give advice — keep practicing and your ratings will increase with time. But the same people with higher rating have prepared for various kinds of maths olympiads and thus are able to solve problems on codeforces very easily. So,

I Just want to know if reaching CM or higher is possible for lower mortals like me or we are just being gaslighted(unintentionally) by higher rated people.

https://www.youtube.com/watch?v=tNmgmwEtoWE

Watch here, how a senior software engineer debunks devin. They just faked their demo. However, the devin team may have achieved their goal. They got $20 million in funding from Peter Thiel. The founders are now set for life. Congratulations to them.
I hate it how normalized faking demos has become. Just few months ago google faked their Gemini demo. It reminds of the dot com bubble, where companies put a dot-com in their names, to get higher valuations and funding and ultimately duped many investors. Only a few companies survived the dot com bubble and majority of them failed.I think the same is happening currently. Companies are putting "AI" in their names to create hype and raise funding. Some of them may become successful, but a great majority are going to fail and disappoint a lot of people. As the saying goes — Those who don't remember the past are condemned to repeat it. I don't want to sound like a pessimist, but it is necessary to be skeptical about whatever we see on the internet(especially when it comes to demos).