Biochemist here. People on Lemmy should read links they post.
As with any buffer system, the pH is balanced by the presence of both a weak acid (for example, H2CO3) and its conjugate base (for example, HCO−3) so that any excess acid or base introduced to the system is neutralized.
A lot of academic labs love to get attention with alarmist claims, and assume the actual data was done properly.
See DTT, see BPA, bullshit that never dies.