Yes, he really said it

For context, as a writer at The Atlantic described it:

The negotiators displayed mainly incompetence, as well as cringeworthy servility to their master in the White House. Trump’s part, though, was pure malignity. Shortly after the meeting ended, he criticized Ukrainian President Volodymyr Zelensky, lied about the latter’s polling numbers, and said, in a particularly callous remark, that Ukraine had had a seat at the table for three years. How being invaded and having your civilians tortured, raped, and slaughtered counts as a seat at the table is beyond understanding.