Yes, it was meant to be light-hearted, but in reality the 2m rule is being broken all the time. Most footpaths/pavements around here are less than 2m wide so unless one party walks in the road they have to break the guidelines. In the Co-op the other day people were distancing, but at times passing each other in the same aisle at around 1m apart. Everyone was within 2m of the till operator.
Unless the cyclist travelling in the opposite direction to you coughed or sneezed in the second or so he was less than 2m away the risk is so small as to be negligible. If you walk on the inside of the footpath he/she would have been more than 2m away assuming he/she was not riding in the gutter.
The only safe way is to not go out at all and have home deliveries, which you disinfect thoroughly before letting into the house. Do not open your newspaper or mail for a couple of days, or disinfect thoroughly.