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How can i change Google Optimize tag to GTM tag in Anti-flicker datalayer?

I installed Google Optimize. There is an issue that I couldn’t figure it out.

There is an Anti-flicker snippet configuration error in Google Optimize. The solution is;

change this code OPT-WQ677VD to this code GTM-WTPKJSR in the anti-flicker data layer. But I am not able to access it or even don’t where the antiflicker code is.

(window,document.documentElement,‘anti-flicker-hide’,‘dataLayer’,4000,{‘OPT-WQ677VD’:true})

Website link: Amazon PPC Tool - Adspert
view-source:Amazon PPC Tool - Adspert

Any help?