While the Internet Archive is generally considered safer than random "rom sites" because it scans files via the VirusTotal API, downloading a BIOS from the internet remains a at best.
: PS2 TEST BIOS 1.50 — Specifically for users experimenting with devkit emulation. PlayStation2Bios directory listing - Internet Archive internet archive playstation 2 bios link
The reality, however, is a complicated lesson in copyright law, digital preservation, and the constant game of "whack-a-mole" between rights holders and archivists. While the Internet Archive is generally considered safer