وَالْأَرْكَانُ ... أَرْبَعَةٌ: الْقِيَامُ وَالْقِرَاءَةُ وَالرُّكُوعُ وَالسُّجُودُ، وَقِيلَ الْقُعُودُ الْأَخِيرُ مِقْدَارَ التَّشَهُّدِ
The matn explicitly lists four agreed internal pillars and then records a view adding the final sitting. The commentary further discusses whether the final sitting is an original pillar, an additional pillar, or a condition. The course therefore should not simply announce 'exactly five internal pillars' without this qualification.