[AdmSmith]

ISIS releases group photo of the terrorists responsible for the #SriLankaTerrorAttack ISIS carried suicide attacks in coordination with Local terror group NTJ- National Tauheed Jamath of Sri Lanka
https://twitter.com/rai_shailendraa/status/1120759811002339329
45 sec of allegiance.

[AdmSmith]

If you listen to the allegiance in the post above at the end they shout Takbir. and before that they repeat what the leader says. This indicates that they are reading from a text that says “takbir” without knowing that that is the name of the specific procedure to actually shout allahu abhar according to this:

(a) It must be in the approved form, i.e. ‘Allahu Akbar’ without any addition or change and without joining it with other wordings.
(b) It must be in correct Arabic.
(c) It must be said while standing (details will come afterwards).
(d) Body must be in ‘tama’ninat’ (not moving, but still).
(e) Muwalaat: The letters and words should be recited one after another without gap.
https://www.al-islam.org/elements-islamic-studies-allamah-saeed-akhtar-rizvi/lesson-32-niyyah-takbir-and-qiyam

My preliminary conclusion is that none of them are fluent speaker of Arabic, and can not even follow a written text. They are just reciting.