Yes, Johann Lietz was illegitimate, and the information about his father Joachim Rabe was added later to the churchbook, due to a judicial decision on 23th January 1851, and confirmed in another judicial decision of 4th May 1851.
But more information about him would be found probably in the baptismal registers 1854 child N.5 & in 1855 child N.24. I guess he married later and had at least two children there.
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[N.] 21
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[born] Julius 7. Morg. 6 U [6 o'clock in the morning]
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[baptized?] 12.
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[father] Joachim Rabe, Gehöftserbe [=heir of a farm] in Spornitz, zufolge eines Rechtserkenntnisses des Großkgl. Amtsgerichts zu Neustadt d. d. 23ten Januar 1851 [=due to a judicial decision of the high kingly local court in Neustadt on 23th January 1851], welches durch einen späteren Rechtsspruch der hohen Justiz zu Schwerin d. 9. Mai 1851 nicht verändert worden. [which wasn't changed due to a later high judicial decision in Schwerin on 9th May 1851]
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[mother] Maria Dorothea Elisabeth Lietz, Hauswirthstochter [=daugther of a "Hauswirth", owner of an house, maybe a landlord] /geboren 1833, Jun: 27 in Spornitz/ [=born 27th June 1833 in Spornitz] /Über den Vater vid. Taufbuch [=about the father see: baptismal register] 1854 N.5 & 1855 N.24/ [belongs probably to the column of Joachim Rabe]
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(probably two columns about the religion of the child?)
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[child] Johann Joachim David Lietz, unehelich [illegitimate]
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[godparents] 1. David Hasmuth, Weißgärber [=tawer] in Parchim /war nicht gegenwärtig/ [=wasn't there]; 2. Johann Lüder, Häuslerssohn [=son of a "Häusler", somebody with an own house but not much property; in english maybe called a cottager?] in Spornitz; 3. David Schröder, Altbüdnerssohn [=son of an "Altbüdner", probably somebody without own land property but with some rights for keeping some livestock on community grounds] in Spornitz
