We'll never know what is in someone else's mind, but does it really matter? It's fraud, whether someone is sorry or not.
I've worked from home since the 80s, and whilst the flexibility to be there for the gas man, or to go to children's nativity plays etc was great, on the whole it meant I worked far more hours than if I'd clocked in and out. I regularly answered emails at 10.00pm and at weekends, and at busy times would be working into the night to meet deadlines. I remember once there was a work to rule. We were asked to record all times we were working, and my 37 hours were up by Wednesday afternoon. Flexibility works to the employers' advantage, even when they don't use it to overload staff hours. Things like Saturday Open Days wouldn't happen without people being flexible, and it is rare that there is another day during the week that they can take off in lieu, even if they wanted to swap a weekend day with family for a Tuesday at home.
I realise that some jobs can't be done from home (mine could, but only if I wasn't needed to give a lecture or attend a meeting etc, so I had to arrange things around that), but I really don't understand why so many people seem to want to see others prevented from doing so. If they are your employees, then fine - you are paying, so can ask for what hours you like, and if you find you can attract good candidates to work them, there's no problem. But when it's people working for others, you (generic) have no way of knowing how hard they are working, any more than you know about the ones in the office who are doing online shopping, or disappearing for smoke breaks, or gossiping to colleagues.
When people have long been out of the workforce themselves, but complain about current workers WFH, I wonder what they think is happening. Most workplaces have changed out of all recognition, even since the 90s, for better or worse.