There are a number of factors that support the idea that their relationship was genuine. First, they both publicly expressed their love for each other on multiple occasions. In a 1993 interview with Oprah Winfrey, Presley said that she and Jackson had "a very real, deep, genuine love." Jackson himself said in a 1995 interview with Diane Sawyer that he loved Presley "more than words can express."
Second, the couple spent a lot of time together in the early 1990s. They were often seen together at public events, and they also reportedly spent a lot of time alone at Jackson's Neverland Ranch.
Third, there are a number of reports that Jackson and Presley were planning to get married. In a 1993 interview, Presley said that she and Jackson had "talked about" marriage. In a 1995 interview, Jackson said that he had "every intention" of marrying Presley.
However, there are also a number of factors that support the idea that their relationship was a publicity stunt. First, both Jackson and Presley were in a lot of financial trouble at the time of their relationship. Jackson was facing multi-million dollar lawsuits, and Presley was deeply in debt. A marriage between the two would have generated a lot of publicity, and it could have helped to improve their financial situations.
Second, Jackson and Presley had very different personalities. Jackson was a shy, introverted person, while Presley was a more outgoing, extroverted person. Some people believe that their personalities were too different for them to have had a lasting relationship.
Third, the couple's relationship ended abruptly in 1996. Presley filed for divorce after just 20 months of marriage. She later said that she had never been in love with Jackson and that she had married him only because she felt sorry for him.
In conclusion, there is no definitive answer to the question of whether Michael Jackson and Lisa Marie Presley had a genuine romantic relationship. There are a number of factors that support both the idea that their relationship was genuine and the idea that it was a publicity stunt. Ultimately, it is up to each individual to decide what they believe.