Nothing is impossible, Newcastle could win their home match against Manchester City.
Newcastle have been a spirited side so far, so they could potentially spring a surprise on a team that has dominated the title for four lucky seasons. Reviewing the previous match against Arsenal, I think there is a weak side in Manchester City that Newcastle can still exploit to at least secure 1 point at home.
But don't think it's easy, so far Haaland is very difficult to stop. He routinely scores goals in every Manchester City match in the Premier League, so he is the most decisive player in the match. If Haaland plays well and can take advantage of many opportunities, then Manchester City will most likely win the match even if Newcastle can score a home goal.
Newcastle chances of securing full points are still open, and they do have the attributes to cause a surprise. However, without meaning to underestimate Newcastle, Manchester City remains the favorite team in the match week 6. Pep Guardiola has several rotation options to replace the injured Rodri, although the match has the potential to be troublesome for both teams, I don't think Manchester City will lose points.
The head to head record of the two teams meetings in the last five matches shows that the defending Premier League champions are still far superior. Arsenal certainly hope that Newcastle can be a stumbling block and hold back Pep Guardiola squad, so that they will benefit from moving up the rankings. Halaand is in his best form, he has scored a total of 10 goals so far. Pep Guardiola will clearly fix the defense, so that Newcastle has difficulty scoring goals even though they are playing in front of their own supporters.