Well, these owners did better than the previous ones
/398 Stanwich Road, which sold new in 2004 for $5.550 million; $5.350 in 2010 (after 366 days on the market); and spent literally years on the market after that, starting at $5.695 in 2012 and finally, finally selling to these owners for $2.9 in 2020. They, in turn, put it back on the market in February of this year at $6.880 million, had an accepted offer immediately, and sold it today for $7 million.
That giveaway price in 2020 was probably because the owner, a (very) wealthy shipping executive, spent much of his time in Singapore, and probably just finally grew tired of it. From what I can find on the Internet, he could afford to take the hit, and may not have even noticed it.
That said, these sellers made out well here.