There is confirming evidence that Tyndale and Luther ever met. But it is certain that Luther's theological writings influenced him. Tyndale used Luther's introductions and marginal notes in his New Testament translation(s). In Tyndale's Prologe to the book of Romans it's estimated that he borrowed about about 75% from Luther.Tyndale was writing only a few years after Luther posted his 95 theses, so it is natural that people might have called him a Lutheran, and indeed, as you point out, he did make use of some of Luther's writings and he appears to have spent some time with him. But neither his Bible translation nor his other writings appear to owe much to Luther.