But the BOM attached is missing components for C14, C19 and C20. I couldn't find the values for those components on any app notes or design references, also, I had access to a dev board for the SX1272 and I noticed that both the capacitors C19 and C20 are not mounted on it, so I'm assuming this should be impedance matching components and not needed for 50 Ohm antennas. Am I right to consider it? As for the C14 I still could not find any reference to what value should it have or how can I calculate it based on my PCB design. Any help is appreciated.
The BOM states the following:
"Remark: components not listed in the BOM are not populated on the module."
So you are correct in your observation that they are not mounted. The capacitors are placeholders should you run into compliance issues due to spurious emissions.