This is false. First off the source that you used is not considered to be credible due to grammar mistakes, the use of a meme, and coming from X. Harris did in fact concede on Wednesday, November 6th, 2024, the day after the election. AP News, a source known to have little bias, said, “Before her speech, Harris called Trump to congratulate him on his victory. She told the crowd that ‘we will engage in a peaceful transfer of power.’” The claim that she has disappeared is also false. According to BBC News, a trusted source, writes “Exactly two months after her election loss to Donald Trump, Vice-President Kamala Harris will preside over the certification of her own defeat.” She did this very thing on Monday, January 6th, 2025. She was seen many times before this as well. She just kept a lower profile.
https://apnews.com/article/kamala-harris-donald-trump-election-ddeae9fb378530159201ef4196cba9b3
https://www.bbc.com/news/articles/cgq1dwpxvnxo