Between 2019 an 2020 nothing has changed in TurboTax regarding these contributions or their entry other than the slight updates to the contribution limits.
It appears that you have skipped over the solo 401(k) (individual 401(k) section and are instead mistakenly trying to using the Keogh, SEP and SIMPLE contribution page that follows. View TurboTax's Keogh, SEP and SIMPLE Contribution Worksheet to see the calculation.
That still doesn't explain why you are seeing TurboTax indicate an excess contribution for a traditional IRA contribution. $110k of net profit is sufficient to support the maximum individual 401(k) contribution plus traditional IRA contributions for both you and your spouse, so you must have made some error entering your self-employment income or expenses.
