Sinn Féin speaking to the press following talks with PM

The transcript discusses the British Government's focus on placating the DUP over reestablishing the executive in Northern Ireland. A tough meeting with the Prime Minister highlighted the need for government functionality amid a cost of living crisis. The proposed unilateral legislation at Westminster is criticized as extraordinary and unlawful. The election results are acknowledged, with Michelle O'Neill as the first minister in waiting. The impasse is seen as coordinated between the British Government and the DUP, with both acting shamefully.

What is the significance of Michelle O'Neill being referred to as the first minister in waiting?

What does the speaker imply about the relationship between the British Government and the DUP?