I feel like they did it on purpose for the attention. Otherwise what would a "memorable edge" be? A screenshot of a website? They knew what they were doing.
It's tough to tell with Microsoft, really. They're definitely cynical and duplicitous enough to do it on purpose and play it off as an unfortunate mistake, but they've also shown themselves to be stupid and out of touch enough that it could be an ACTUAL mistake 🤷
Otherwise what would a "memorable edge" be?
Ever since Google became a verb, tons of other corporations have been super needy about wanting to be verbed, nouned or (as in this case) verbed and then nouned. It's pathetic, really.
You have a point overall, but remember that whoever posts this is a person with writing and technology skills, it's not done by a MS-approved committee. The person who wrote it might have free rein over the account, or they might be showing their tweets to an editor first, but one way or another some actual human had to put these sentences together and think about what they meant. So did MS hire and retain someone who has never heard of edging? Possible, but I find it hard to believe.
whoever posts this is a person with writing and technology skills
To put it in the nerdiest way possible: just because you have high INT doesn't mean you have high WIS. And even if they did, they could have rolled a nat one on their arcana check.
Or in case you're not into baseball: smart people are sometimes idiots and brainfarts happen.