thats nothow you make it. you are also not in the bedrock preview which is only where you can get it

You need a copper block and a carved pumpkin (will only work when you’re on the right version).

You need a pumpkin on a single copper block, and even then if you arent in the version you cant get it

You need mods. Go to curseforge.com to download the mods

the copper gollem is in the latest bedrock preview. also cant you see he is playing bedrock. modrinth is better then curseforge