As has been mentioned in many many threads on this forum, LRPT decoding is not part of the core SatNOGS demodulators yet.
Stations that have been doing LRPT decoding are using a custom flow-graph and post-processing script, which at the moment does not work in the new client version (though some progress is being made on this). The original flow-graph ignores the baud-rate field, and uses 72kbaud, which is what Meteor M2 usually uses.
The flowgraph only produces QPSK soft-symbols, it does not save an image. Another utility (medet_arm) is used to decode the QPSK soft-symbols into images, and this utility barely runs in real-time on a RPi3, making me question if a true real-time decoder is going to be possible on something like a RPi.