This is a true claim. An article by Maine Public discusses the rise in homelessness across the state, stating "a significant spike compared to previous years." The article quotes Cullen Ryan, the executive director for Community Housing of Maine, saying that the has been "unable to find places for people to go." This is further supplemented by the article stating that there is a "lack of housing options across the entire state."
Homelessness on the rise in Maine, according to 2022 survey | Maine Public
Another article by The Associated Press discusses a new homeless shelter built in Maine. The article states that the shelter was built "as Portland grapples with hundreds of asylum seekers who have arrived in the new year and are vying for beds with others experiencing homelessness."
Maine's largest city opens new homeless shelter | AP News
Based on the rise in homelessness, as well as the state building new shelters, it is reasonable to infer that Maine is seeing pressure to provide more housing for their growing homeless population.