I had the same issue on my 2021 110 s p300 after 2 years and 25000km.
Exact same radiator and leak placement! Must be a production or assembly defect.
I took it in after multiple coolant top ups. LR fixed it under warranty in 2 days.

 

If you are outside warranty, it is easy to replace the aux radiator yourself. See thread linked below. I got an aftermarket radiator for $85. OEM is known to leak, so why bother spending $300. I've done about 500 miles since the repair and no issues.

https://landroverforums.com/forum/20...cement-121895/