I meant PHP 8, in 8 the error is fatal, in 7 it's depreciated.
Either way, the plugin was probably written for PHP 5.x, and when 7/8 came along there are some differences like {} and [] make more of a difference, or like in your case where it needs more parentheses to show the execution order. I think they changed that since a lot of people did nested things and it loaded wrong, something like that.
So, you can edit the code, downgrade PHP, or find someone to fix it for you. Shouldn't take too long, I'm going to work tho.

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