CJA: Segmenting Redirect Traffic Without Losing Downstream Engagement

We’re a parent company with a user-facing website that our subsidiaries use. Many of them are retiring their external websites and redirecting traffic to dedicated landing pages on our main site via 301 redirects.

To prevent this redirected traffic from inflating our core site metrics, we want to exclude views, sessions, and people associated with the initial landing page hit — but still include any downstream engagement from users who continue navigating further into the site.

In the Segment Builder, I’m using an Event-level segment to accomplish this. See the attached screenshot:

Based on my validation in the table below:

• 4 of the 6 metrics (page views and conversion metrics) line up exactly between the segment and my manual calculations

• But Sessions and People are showing ~4% higher in the segment than expected

Is this discrepancy expected behavior? Or is there a better way to exclude redirected landing page metrics without losing downstream metrics?

I appreciate any insight!