There are many method to check an altcoin is probably scam.
I think your method is good to follow
All your point you raise here are very valid, but for me what I mostly watched out for is if it's been listed on binance or bybit, if it's not been listed on any of it, I stay off that coin to avoid stories.
Your simple method is good but usually the coin/token price will increase too much when they got listed in binance.
And i have some token which got listed by binance but it's gone now