Such a claim is little more than a myth. Ibn Taymiyyah actually said:
"And the salaf of the Ummah and its leading scholars, and all of Ahl al-Sunnah wal-Jamaa'ah are agreed that there are from the created things those which will not cease to exist, and will never entirely perish, such as Paradise and Hellfire, the Throne and other than that. And none spoke of the expiration of all of the created things except a faction from the innovating ahl al-kalaam, such as al-Jahm bin Safwan and whoever agreed with him from the Mu'tazilah and their likes." (Majmu' al-Fatawa 18/307)
There is no source confirming he held an alternative view aside from a fabricated book that no muhaqiq validates as a book he authored. The riwaya that Ubn al-Qayyim mistakenly claims was his which he corrects in Shifa al-Alil.
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