What does the code data-saferedirecturl mean on a backlink?

I received a link from someone for a guest post. After analyzing the source code, saw this in the URL:

<a href="https://domain dot com/page-name/" target="_blank" rel="noopener noreferrer" data-saferedirecturl="https://www dot domain dot com/url?q=https://domain dot com/page-name /&amp;source=gmail&amp;ust=159059709457500&amp;usg=AFQjNFeCDZxyxbgUZk9cwkqCQpe9RPm3Sg"

I am not a developer so don't know what it means. Is it a legit link to my site that will pass maximum juicage?

submitted by /u/rpmeg
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