GTM submit form with confirmation text does not working

When I try to add event to GTM with trigger (certain confirmation text on page), there is no any text in page properties (by right-click on the request an estimate page - View page Source) and in GTM Debug mode (Variables).
I thought I could create a trigger based on if a CSS class contains a certain text. BUT when I inspected my page I did not find confirmation text there at all:(

Any thoughts?

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