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In fact I would say that it's complete conjecture to say they were used extensively against xenos in 30K and are still used in 40K, for the box of text you posted mention that their primary use was against the Dark Mechanicus and Traitor Legionnaires. While it may be possible, it still is conjecture. They seemed to be a rare thing before the Heresy probably because their use was indeed very limited to certain target and certain types of boarding action. When fighting became more intense, the need to kill monstrous superhuman warriors in cavernous corridors of ships became a huge necessity. Ironically, they were probably a very rare and limited tool before they became a necessity. Think of them like the M26Pershing tanks who were made and deployed in the last year of WWII to hunt and destroy heavy tanks, but saw very little use outside of zones where air support could do the job more efficently and were close support tanks were more usefull. If allied forces had not win the sky yet, these tanks would have been very important to prevent the Nazi armored division to crush them.