It looks like they corrected it after realizing it was a different idea (YAY!).
I saw this part: "Auto-grading fill-in-the-blank questions would require teachers to anticipate every possible misspelling or typo, which is impossible to predict." It got me thinking about the "Close Enough" option I mentioned earlier.
I tried a test to see how it worked. I specifically wrote questions in which the correct answers were "Right of Deposit" and "Lewis & Clark" with the options Close Enough. This option presents two things, a "Levenshtein Distance" and a checkbox for "Spelling Only." The first option essentially works out to how many characters can be changed and it still grades it correctly. The second option ignores when students use all caps or fail to use caps. I set the Levenshtein Distance to 3 under the idea that it would except the word and instead of the &. When I took the test as a student, I specifically typed in "Right for Deposit" and "Lewis and Clark" rather than what I put as the answer. The system autograded my attempt as correct answers. Feasibly, it would also accept answers like "Right of daposit," "Louis & Clark," "lewis and clark," etc. Having not really explored the Close Enough option, this helped me better understand it myself.
This could potentially help cover some basic errors like the ones you mentioned. Be aware that the higher the number for the Levenshtein Distance, the more letters off it could be. So higher values will allow for larger variations in answers. It also means you cannot put things like "Clark & Lewis" as a possible answer. In that situation, you may consider implementing a system where a student may review their graded exam and request a review. Maybe even have a form they fill out where they indicate an answer they got wrong that should be reviewed, with the requirement that they justify why their answer is correct. It would force students to review their work more diligently and support Claim/Evidence/Reasoning logic in their responses. This could also reduce your worry about spending too much time typing in all the possible typos and reviewing already graded answers. You might even find students more positively engaging in raising their grades in the long run as they find that you accept justifiable arguments and reject frivolous ones.
Some thoughts to consider.