“Praise be to Allah who has fed me and granted me provision.”?
Question

                The du’a said after eating, "Alhamdulillah allathi atamani wa razaqanihe wa ja alani minal muslimeen" is from a weak hadeeth but I do not have the proof for it. Someone is asking for proof. Can you please explain it.
Praise be to Allah.
    The wording of the 
    hadeeth is: It was narrated that Abu Sa’eed (may Allah be pleased with him) 
    said: When the Prophet (peace and blessings of Allah be upon him) ate or 
    drank something, he would say, “Al-hamdu Lillah illathi at’amana wa saqana 
    wa ja’alana Muslimeen (Praise be to Allah Who has given us food and drink 
    and made us Muslims).” 

    Narrated by Abu 
    Dawood, 3850; al-Tirmithi, 3457. 

    Shaykh al-‘Albani 
    said in his commentary on al-Kalim al-Tayyib (189) by Shaykh al-Islam Ibn 
    Taymiyah: 

    Its isnad (chain 
    of narration) is da’eef, because the narrators were confused about it, as 
    explained by al-Hafiz in al-Tahtheeb; and by al-Hafiz al-Mazzi before him in 
    Tuhfat al-Ashraf, 3/353-354; and by Imam al-Bukhari before them in 
    al-Tareekh al-Kabeer, 1/1/353-354; and by al-Nasai in al-Yawm wa’l-Laylah, 
    288-290. And al-Tirmithi, despite his well-known lenience, did not class it 
    as hasan (sound), 

    There are similar 
    ahadeeth (narrations) which are proven from the Prophet (peace and blessings 
    of Allah be upon him) concerning this matter, such as the following: 

    -         It was 
    narrated from Abu Umamah (may Allah be pleased with him) that when the 
    Prophet (peace and blessings of Allah be upon him) had finished eating – and 
    one time he said, When the table was cleared – he would say, “Al-hamdu 
    Lillaah illadhi kafana wa arwana ghayra makfiyyin wa la makfoor (Praise be 
    to Allah Who has satisfied our needs and quenched our thirst. Your favour 
    cannot be compensated or denied).” And on one occasion he said, “Al-hamdu 
    Lillahi rabbina ghayr mukfiyyin wa la muwadda’in wa la mustaghna rabbana 
    (Praise be to Allah our Lord. Your favour cannot be compensated, nor can be 
    left, nor can be dispensed with, O our Lord).” Narrated by al-Bukhari, 5459.

    -         It was 
    narrated that Abu Ayyoob al-Ansari (may Allah be pleased with him) said: 
    When the Messenger of Allah (peace and blessings of Allah be upon him) ate 
    or drank something, he would say, “Al-hamdu Lillah illathi at’ama wa saqa wa 
    sawwaghahu wa ja’ala lahu makhrajan (Praise be to Allah Who has given food 
    and drink, made it easy to swallow and has made a way out for it).”

    Narrated by Abu 
    Dawood (3851) and classed as saheeh (authentic) by al-Albani in al-Saheehah 
    (2061). 

    And Allah knows 
    best.