The issue is co2 is produced as a byproduct of the ammonia production used as fertilizer. There's a slower requirement by farmers at present so many plants have shut down for maintenance all over Europe. This has led to the shortage Europe wide.
The brewers are protecting their co2 supplies but...
And as per usual they talk shite. Very rarely do any of these men with beards actually work in the brewing industry and anyone who has ever been to one of their events will tell the way they run their beer tents is not good.
Best listen to an expert, not landlords as they are normally set in...
No gas pumps pump the beer using mainly beer gas either a mixture of nitrogen and carbon dioxide or 100% co2, or compressed air via a compressor. The gas/air never comes in contact with the beer.
Indeed keg beer/cider can have compressed air connected via the coupler. The reason for the need of...