Japan has not publicly denied that any trade deal was signed with the Trump administration; rather, both countries have acknowledged reaching a trade agreement, though there are significant disagreements over its terms and implementation.
Japan just publicly denied that any trade deal was signed with Trump.

Japan, U.S. ministers reached trade agreement in mid-June: sources
Source: english.kyodonews.net
Key Evidence
Japan's chief negotiator confirmed reaching a trade agreement with the U.S. Commerce Secretary in mid-June.
Japan released an outline describing its understanding of the tariff deal with the Trump administration.
However, Tokyo contests some U.S. Claims about profit sharing and other details.
What the Evidence Shows
The claim that Japan 'just publicly denied that any trade deal was signed with Trump' is not supported by available evidence. Multiple credible sources confirm that Japan and the United States reached a trade agreement in mid-June, involving tariff adjustments and Japanese investment commitments. While there is clear discord between the two sides regarding profit sharing and interpretation of the deal's specifics, Japan has not outright denied the existence of the deal.
Instead, Japanese officials have released outlines of their understanding of the agreement and expressed concerns about certain provisions. President Trump publicly touted the deal as historic and significant,english.kyodonews.netenglish.kyodonews.netJapan, U.S. ministers reached trade agreement in mid-June: sources but experts and analysts have criticized aspects of it and noted ongoing disputes. The claim likely arises from misunderstandings or misinterpretations of Japan's cautious or critical statements about the deal's terms rather than a categorical denial of its signing.
Therefore, the statement is mostly false because it misrepresents Japan's official position on the trade deal.