In response to the Pooh-Bah's complaint that the Pooh-Binah had misspelled his name, the Pooh-Binah replies: I capitalized it 'cause it was the beginning of the sentence

The Pooh-Bah responds: so where in Strunk & White do it say that sentence placement takes precedence over improper spelling?!

I must say, that strictly speaking, choice of capitalization is not a matter of spelling. T is a t is a t, to coin an old paraphrase.

That said, none other that whatever the name of that on-line magazine is has decreed that words which would normally be capitalized, such as people's names, e.g., t. s. eliot, but aren't, remain uncapitalized in contexts in which normally uncapitalized words would be capitalized, e.g., at the beginning of a sentence.