Hello.
In the ‘Triglot Concondia’ of the Lutheran Church is a section headed: ‘The Formula of Concord – Summary Content of the Articles in Controversy’. Part 2 of this section is headed: ‘Of Free Will’, and contains the following statement:
'For without His grace, and if He do not grant the increase, our willing and running, our planting, sowing, and watering, all are nothing, as Christ says John 15, 5: ‘Without Me ye can do nothing’ . With these brief words He denies to the free will its powers, and ascribes everything to God’s grace, in order that no one may boast before God.’
Note the words: ‘He denies to the free will……’
It is possible that someone has misread (or misquoted) these words, and taken them to mean that Christ denied free will altogether. This, of course, would place Christ in error.
Luther believed that Christ was both wholly man and wholly God. It is unlikely that he would attribute error to Christ in matters of faith and morals. However, Lutheranism is not my field, and I could well be mistaken.
I’ve left a message with the ‘go-to’ Lutheran on another Christian Forum. Not sure that he is still active (I’ve not been on that site for some while); but, God willing, I’ll pass on any reply he gives.