OP was quoting wikipedia which also says that business+chief+employees were transferred to a new company Shin-Kongo (ie “New Kongo”).
So it depends on what you mean by “they”, the company with the old name Kongo Gumi is no longer in construction, but otherwise the company with the new name Shin Kongo is, as a subsidiary of another conglomerate.
Bloomberg also had an article
https://archive.is/rLnnH