Equipment calibration requirement within a Reliability (aka: R&D) Lab

We encountered an event where the measuring equipment used in the R&D (Reliability) Lab were not calibrated or on a calibration frequency. The owners of this lab was explaining it is not required or needed as the results are not directly connected to products/services we build and ship to our customers.
This confused me as I was under the impression within ISO 9001:7.1.5 that all measurement equipment should be calibrated. I feel as though I am ignorant in this instance. Almost if there is an exception to this rule I have not experienced yet.
Has anyone else experienced this? Can someone help educate me for this instance?