Not only do I not see any statements in the OP claiming insider secrets, it's ironic for you to be judging someone else's article while you have made a borderline shit-post yourself.
Then what do you think about these?
Although mining Bitcoin at home with a powerful graphics card or computer is feasible, the competition is fierce and there are few opportunities to make significant profits. The mining industry is fiercely competitive and demands a large amount of processing power.
There's no opportunity to make profit, unless you're very lucky to hit a block through solo mining while using CPU/GPU.
Anyone can be a part of a pool and still profit from contributing their power.
You may want to visit thread BITCOIN MINING INTRO & RULES OF THIS SUBFORUM - READ BEFORE POSTING. It clearly state it's impossible to earn profit by mining Bitcoin using CPU/GPU.
When did you write this article. ETH already moved to PoS in 2022.
He said each one has its distinct algorithm and set of mining guidelines. Ethereum's distinct (consensus) algorithm is POS.
The article said "distinct algorithm and set of mining guidelines", so the example should be example of cryptocurrency that can be mined.
I disagree. The website specifically talks about blockchain, so IMO it's normal to have expectation that they're being careful about what they write.