Will google see "404 redirect to homepage" as doorway spam?

This is a SEO question that bother me for almost a week now, i have tried searching online for more specific case study, and nothing appear to be relevant. I merely find anything good from google nowaday!

What i want to know is how "404 redirection to homepage" and is this considered to be a doorway spam by google or not? Since you can have hundreds of URL that is no longer exist, and its URL can be with keyword. After you set it to redirect to homepage, the bot will see hundreds of URL and...

Will google see "404 redirect to homepage" as doorway spam?

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