According to the article, after this latest accumulation of 8,888 BTC, the wallet's total Bitcoin holdings are approximately 66,465.20 BTC, worth close to $3 billion at current exchange rates. These are really big numbers.
If this wallet really belongs to Tether, this is reassuring news for holders of the USDT stablecoin because at least their assets will be covered by Bitcoin assets, giving some kind of security.
Also, the collection of all these huge amounts by these large companies is an indication of the extent of trust that Bitcoin enjoys among large institutions.