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You kind of buried the lede there:
Overall, these results show that voters continue to be concerned about Biden’s age — but there is not yet clear evidence that an alternative nominee would significantly outperform him against Trump in a head-to-head matchup.
That’s evidence that some candidates poll similarly to Biden.
That’s not evidence the best thing Biden can do to stop Trump from becoming president is drop out.
That quote comes directly from the poll you linked.
That’s a specious conclusion you’re jumping to because it supports your biases. With out more information it’s more likely that once the respondents know who the candidates are the overall responses will fall in line with the population averages and the candidates polling results will be the same as they are now.
All we can confidently conclude for now is “39%-71% of people polled don’t know who the candidates in the polls were”.