Should I buy ps5 waterblock ?

So if you type ps5 watercooled you will see these guys from Vietnam who have built a watercooled ps5 I saw it and was like he'll yeah and I'm not trying to get people saying how dumb a watercooled ps5 is or how ps5 isn't even that hot I am just wondering I messaged them on YouTube and they gave me there number and said that I could buy the parts to build it myself if I wanted to first they said $800 and when I said I couldn't afford that they said $300 they obviously have alot of money and make tons of pcs and everything should I trust buying it from them or do you think it's probably a scam? If you search watercooled ps5 you will see video on YouTube right away