It's the exact same playbook as Huawei -- govt-backed "dumping" of loss-priced goods in an attempt for total market dominance. And US companies have historically been way too willing to expose trade secrets to Chinese manufacturers in exchange for temporarily cheaper supplies -- a Faustian bargain.
American furniture manufacturing does have one significant advantage in the US compared to its offshore competitors: proximity. Furniture is bulky to store and time-consuming to ship. The one manufacturer who realized this, John Basset, is the titular "Factory Man" who has kept his factories running by doubling down on just-in-time delivery, etc.
The Bassett family history and corporate provenance is weird and a bit incestuous (both figuratively and literally; J.D. married a cousin), and I really do recommend reading Macy's book for the full scoop.
The Chinese made cheaper furniture due to a lot of reasons, cheap labor, cheap resources, and presumably lower quality may be some of them, but selling at a loss definitely is not.