Meditation on word udgîtha for food

I came across this while reading a doc. please clarify more points on this.

Let a man meditate on the syllables of the udgîtha, i. e. of the word udgîtha. Ut is breath (prâna), for by means of breath a man rises (uttishthati). Gî is speech, for speeches are called girah. Tha is food, for by means of food all subsists (sthita).

7. Ut is heaven, gî the sky, tha the earth. Ut is the sun, gî the air, tha the fire. Ut is the Sâma-veda,, gî the Yagur-veda, tha the Rig-veda 1.

[paragraph continues]Speech yields the milk, which is the milk of speech itself 1, to him who thus knowing meditates on those

syllables of the name of udgîtha, he becomes rich in food and able to eat food.

https://www.sacred-texts.com/hin/sbe01/sbe01024.htm#fn_86