> The video in question uses a different (dictionary) definition of the term from the authors of the article.
Both the video and authors of the article use the same definition. The article notes that the video "includes an important word that the narrator glosses over" (hint its the word 'generally').
> This is partly the justification for them declaring the video as false
Using a different definition is not their justification (partly because you just made this connection up). They ruled the post as false because it stated the White House was changing the definition of 'recession' when it was not.
> flagging it as potentially harmful misinformation.
The intent of the video is clearly to indicate the White House is changing definitions to suit their narrative. In reality this was not the case. The effect is discrediting or undermining the trust in the white house. If you think this isn't potentially harmful, that might speak more to your political inclinations than the objective reality.
> The overreaction alone is sufficient for me to question the website’s priorities.
Now this is ironic.