[Mumps]

You are correct. This is pronoun ambiguity. I also immediately noticed it and was displeased to see it as the opener of the article. As in, I no longer expected correctness of anything else the author would write (I wouldn't normally be so harsh, but this is about text processing. Being correct about simple linguistic cases is critical)

For anyone interested, the textbook example would be:

> "The trophy would not fit in the suitcase because it was too big."

"it" may refer to either the suitcase or the trophy. It is reasonable here to assume "it" refers to the trophy being too large, as that makes the sentence logically valid. But change the sentence to

> "The trophy would not fit in the suitcase because it was too small."