Why is this information being kept hidden when he is the star of the show?

https://www.yahoo.com/news/judge-refuses-tell-jury-trump-212617288.html
Judge refuses to tell jury in Trump civil rape trial that former president is 'excused'

The federal judge in the civil rape trial of former President Donald Trump said that his request for special jury instructions in the case is “premature” in a filing Thursday.

U. S. District Judge Lewis Kaplan, who is presiding over the trial in Manhattan stemming from writer E. Jean Carroll’s lawsuit, responded a day after Trump’s lawyer sent him a letter indicating that Trump might take the witness stand in the trial but saying would be too difficult for him to attend the entire trial for logistical reasons tied to his former office.

In his letter Wednesday, the lawyer, Joe Tacopina, asked Kaplan to instruct jurors: “While no litigant is required to appear at a civil trial, the absence of the defendant in this matter, by design, avoids the logistical burdens that his presence, as the former president, would cause the courthouse and New York City. Accordingly, his presence is excused unless and until he is called by either party to testify.”

Kaplan responded that the court does not accept Trump’s counsel’s “claims concerning alleged burdens on the courthouse or the City” if Trump were to testify. He noted that Trump is under no legal obligation to be present or to testify and that Carroll’s counsel has signaled that she was not planning to call Trump as a witness.

Why is this information being kept hidden when he is the star of the show?
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