So it's 100% altcoin creation. How can it be Satoshi original idea when his original idea still going strong?
Not altcoin per se. A split from bitcoin core so they can carry on limiting the blocksize, this coin will allow blocksize to increase. Coins are still from Satoshi's original chain and this will continue Satoshi's original whitepaper and Core will continue going against Satoshi's whitepaper and do whatever they please. Technically this should be the original Bitcoin and Core should be the altcoin.