Whom anxiety?

[Joel S. Berson]

The first sentence in the lead article of today's NYTimes, writen by
Nelson D. Schwartz and Eric Dash:

"Bank of America is completing an agreement to pay $8.6 billion to
settle claims by investors that purchased mortgage securities that
soured when the housing bubble burst, according to people briefed on the deal."

Did the writers have whom anxiety, fretting over whether to use
"whom" or "who" in the phrase "by investors that", and evaded the question?

Joel

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