Do you really need to read his post again??? He already said that SIGNED mods are not using GOOGLE to prevent your account will be banned while UNSIGNED mods are useable with GOGGLE and you can purchase iap as usual.我不能使用goole账号登录,而官方版本可以正常登录。
Why can't I log in with my goole account, while the official version can log in normally
This game is SIGNED mods, that means GOOGLE is not usable and any other login methods still can be used if avaiable