Juniper is still decently popular in their core routing business. On k12 and small enterprise they've had good fortune with their Mist acquisition. I think the latter was honestly the main driver for the merger.

I think GP was trying to say a few network companies are buying everything up not that Juniper had a majority share itself though. Look at the merger graphs for Cisco, HPE (adding in Juniper's now), and Extreme and a lot of the diversity that used to be "not Cisco" and became alternative growth is going back to being a few companies with a stranglehold on share again.