Clearly his excuse on Facebook is true(insert sarcasm). He failed upload is runs due to the internet and then deleted old activities on the watch to make room for new ones.
Rob take a close look at your watch, it's a TomTom not a Garmin. you can't browse to those activities and delete to "make room" it just doesn't work like that. Your TomTom will sync everything the next time internet is around.
Maybe Rob Factory Reset his watch after each run....he seems to be well adapt at that process.
I notice Rob learnt from that and excuses since that one have been far less specific like "I made mistakes". "I will run a 6-day race to prove the earth is flat".