Sorry you're right, I mean to say the word salah in 73:20 comes as a separate/new statement (command to uphold these 3: salah, zakah, lend loan) but not in the text where people interpret/interpolate it as nightly tahajjud salah. Hope this clear up my question based on that observation. Thanks for the correction.
Literal
(Word by Word) 73:2
Stand (in) the night, except a little,
Traditional 73:2
Stand all night ˹in prayer˺ except a little—
Literal
(Word by Word) 73:20
Indeed, your Lord knows that you stand (a little) less than two-thirds (of) the night, and half of it and a third of it and (so do) a group of those who (are) with you. And Allah determines the night and the day. He knows that not you count it, so He has turned to you, so recite what is easy of the Quran. He knows that there will be among you sick and others traveling in the land seeking of (the) Bounty (of) Allah, and others fighting in (the) way (of) Allah. So recite what is easy of it, and establish the prayer and give the zakah and loan Allah a loan goodly. And whatever you send forth for yourselves of good, you will find it with Allah. It (will be) better and greater (in) reward. And seek forgiveness (of) Allah. Indeed, Allah (is) Oft-Forgiving, Most Merciful.
Traditional (as example) 73:20
Surely, your Lord knows that you stand (to pray at night) a little less than 2/3rd of the night, or ½ of the night, or 1/3rd of the night, also a party of those with you. And Allah measures the night and the day. He knows that you can never calculate it (unable to pray the whole night), so He has turned to you (in Mercy). So, recite from the Qur’an as much as may be easy for you. He knows that there may be some sick among you, and some others who travel through the land to seek Allah’s Bounty; and yet, some others who fight in Allah’s cause. So recite as much of it (Qur’an) as may be easy for you, establish prayer, pay obligatory charity, and lend to Allah a goodly loan. And whatever good you will send before you (leave the world) for yourselves, you will certainly find it with Allah, which is better and greater in reward. And seek the forgiveness of Allah. Surely, Allah is Forgiving, Merciful.